I really don't think its a bad trade. If you need speed, I'd definitley take Reyes/Loney over Berkman/Young. Murphy and Dejesus are a wash IMO, and Overbay is platooning now with Millar, so losing him shouldn't be too big a deal.
SP - Halladay, Peavy, King Felix, Weaver RP - pick up and drop streaky guys
C - B Molina, Posada (start 2) 1B - Pujols 2B - Hill SS - Young 3B - Atkins MI - Casilla OF - Hunter, D Young, Dejesus, J Upton, Byrnes, Church (Laporta is on my bench) DH - Beltre most nights
I'd do the deal. Reyes is heads above the rest. Once your past Berkman, Young, Reyes, Murphy the rest are just waiver wire throw-ins. If you can get Reyes for that price, I'd jump all over it.
I actually don't like this trade for you. While Reyes is a top SS, I would much rather have the production from Berkman and Young than the production of just Reyes. I would try to trade for some cheaper maybe Victorino.