http://www.baseballamerica.com/minors/2014-baseball-america-top-100-prospects-free/
3) Taveras OF
10) Polanco OF
14) Addison Russell SS (already traded for Shark who had an extra year and hammer a averagish SP for the rest of the year just for a baseline)
15) Bundy SP
21) Giolito SP
25) Castellanos 3b/LF
31) Carlos Martinez SP
34) Pederson OF
37) Seager ss/3b
49) Austin Meadows OF
The above are centerpiece guys who are various levels of untouchable I would think but I didn't think we'd get the Giants 2nd ranked pitching prospect for what's left of Peavy.
If I were Ben and I got offered any of the above guys as a centerpiece of a deal for Lester/Koji I would seriously have to consider it. Teams are all ones that are in the hunt and looking to be buyers.
The Cardinals probably say no to Ben if he offered Koji and Lester for Taveras but they might think about it for a minute.