Looked at the Cubs prospects.
Let me first say, their current big league catchers are hitting a combined .191 with an OPS under .550.
They have a guy named Welington Castillo, their 6th best prospect per Keith Law. Don't think he's much to talk about considering the depleted depth on the Cubs right now. He's also 25, has had a couple cups of coffee in the bigs, and didn't fare too well.
I could see a deal involving Lavarnway + Coyle + a mid-to-low level guy for Garza working out. I think the Sox have a bit of an advantage because of how well Theo and Hoyer know the Sox farm system.
They could even go with a guy like Frank Montas who throws the ball 100 mph, but is very rough and raw on the mound right now to stick in the trade.
Perhaps the Sox settle for a couple B level prospects for Youk, or a high ceiling, low floor/level prospect and a B level guy that the Sox could include in the deal.
I've read a lot that the Sox are really looking for SP right now, so Garza would fit the bill. He's a guy who isn't afraid to go out there and go right after guys rather than nibbling all the time.
A rotation of Lester Beckett Buchholz Garza Doubront, bullpen of Bard, Aceves, Bailey (eventually), Miller, Melancon, Albers, Padilla, and Atchison (until Bailey comes back).
Then you have a lineup of:
Ellsbury
Crawford
Pedroia
Ortiz
Gonzalez
Middlebrooks
Salty
Ross/Sweeney
Aviles
You pull the deal on a trade for Garza, and you get healthy. Now all of a sudden you're making a very, very serious run at the AL East, not just a WC.