When a club trades five prospects (including their minor league pitcher of the year) in exchange for a starter, they usually get an ace in return. But not the Cubs.

On Friday, the Cubs traded top pitching prospect Chris Archer, outfielder Brandon Guyer, catcher Robinson Chirinos, shortstop Hak-Ju Lee and outfielder Sam Fuld to the Rays in exchange for Matt Garza and two minor league prospects. Garza, who is coming off a career year, immediately fills the No. 2 void in Chicago’s rotation.

The key players for Tampa Bay were Archer and Lee. Archer went 15-3 during two different minor-league stints last season and won the Cubs’ 2010 minor league pitcher of the year award. Lee needs a couple of years in the minors to develop, but he’s regarded as a skilled defender with excellent speed and good range at shortstop.

Considering Garza won’t be viewed as an ace in Chicago, it stands to reason that the Cubs overpaid. But GM Jim Hendry had to do something to improve his rotation and at 27, Garza is already in the prime of his career. He’s also coming off a season in which he compiled a 15-10 record with a solid 3.91 ERA and 1.25 WHIP. He averaged 6.6 strikeouts and 2.77 walks per nine innings and hitters batted just .248 against him last season.

He’s switching from the AL to the NL, so one would think that his numbers will only improve (or at the very least, stay the same). That’s huge for the Cubs, who desperately needed a top-of-the-rotation arm to go along with Carlos Zambrano and Ryan Dempster. The NL Central isn’t considered a powerhouse division but the Cubs will face Albert Pujols, Matt Holliday, Prince Fielder, Ryan Braun, Joey Votto and newcomer Jayson Werth on a consistent basis so they needed to beef up their starting five.

Besides, what constitutes being an “ace” anyway? Cliff Lee wasn’t very ace-like in the World Series and Tim Lincecum had an atrocious August before rebounding to help the Giants win a championship Usually when you think of aces, they have overpowering stuff. Well consider that Rays’ pitching coach Jim Hickey once referred to Garza as having “the best stuff on the staff” and the fact that he can throw his curve, slider and change for strikes will only help the 27-year-old at the smallish Wrigley Field. He also no-hit the Tigers last year, so clearly Garza has what it takes to be the “ace” of the Cubs staff, even if he doesn’t take the mound on Opening Day.

The bottom line, perhaps, is that the Cubs acquired a proven player for several unproven commodities. There’s always a risk in a deal like this that a club will get burned when a prospect they traded away turns into a star. But as of January 7, 2011, this looks like a deal that works for both sides.

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Offseason Movement: The Cubs were seemingly hosed by the Indians in a trade that sent ultra-utility player Mark DeRosa to Cleveland in exchange for minor league pitching prospects Jeff Stevens, Chris Archer and John Gaub, none of which were viewed as top 10 prospects in the Tribe’s organization. But maybe one of those youngsters will emerge as a quality arm down the road and DeRosa’s contract does expire at the end of the season so at least the Cubs got something for him. Chicago also added volatile outfielder Milton Bradley, reliever Kevin Gregg and pitcher Aaron Heilman, who will move to the bullpen after losing out to Sean Marshall this spring for the Cubs’ fifth spot in the rotation.

Top Prospect: Josh Vitters, 3B
This club is loaded with quality prospects, including reliever Jeff Samardzija, shortstop Ryan Flaherty and outfielder Tyler Colvin. But Vitters appears to be the best of group, with his excellent plate approach, outstanding hand-eye coordination and natural swing. Thus far in Single-A, Vitters is hitting .357 and slugging .529 in 70 at bats. At only 19, he still has a ways to go before he’ll make his big league debut, but Vitters appears to have quite a future ahead of him.

The Big Question: Will the bullpen be the Achilles Heel?
The Cubs allowed Kerry Wood to jettison to Cleveland in the offseason, but signed free agent traded for Kevin Gregg to compete with 26-year old Carlos Marmol for the right to be the club’s closer this season. Manager Lou Piniella is expected to announce who his closer will be soon, but if he’s basing the decision on spring performance, Gregg should earn the job. That said, Marmol clearly has the more electric stuff, but has been erratic and inconsistent when given opportunities. Prized prospect Jeff Samardzija is also expected to see time as a late-inning reliever, but he’s been brutal so far in spring training and might need more seasoning in Triple-A. Long relief is where this club could have issues, as Luis Vizcaino (27 ER in 46 IP last year), Chad Gaudin and Angel Guzman (6.00 ERA in 96 IP) all come with their flaws. But free agent signing Aaron Heilman (acquired via trade with Seattle) should help in that category and hey, at least there’s no chance of Bob Howry making any appearances after he signed with San Francisco in the offseason. The offense and starting pitching is solid, but perhaps the key to the Cubs’ success this year will rest upon the arms in the bullpen.

Outlook: I’ll save Cub fans the aggravation of reading another preview dedicated to curses, Billy goats and failed expectations. I’m sure they’ve already gotten enough of that from every other sports site and blog on the net. The bottom line is that the Cubs are built to win now and have one of the strongest rotations in the NL, led by a three-headed monster in Carlos Zambrano, Ryan Dempster and Rich Harden. The lineup is also one of the most balanced in baseball and while losing Mark DeRosa hurt, the signing of Milton Bradley (when healthy and taking meds) added a quality bat to the middle of the order. The bullpen has some question marks, but as long as Kevin Gregg or Carlos Marmol are reliable in the closers role, then the Cubs should win the NL Central and make another postseason appearance. Once they’re there, who knows? This club hasn’t shown the mental fortitude to win in the postseason but that doesn’t mean it can’t do it this year. As long as guys like Aramis Ramirez, Geovany Soto and Alfonso Soriano continue to produce, the Cubbies will once again give themselves the opportunity to win a World Series title.

Projection: 1st NL Central