Prince/Adams for Halladay/Darvish/Pena

[Thursday]

Hey Cafe,

I have an owner in my league coming hard for Prince Fielder. He's offered me this:

I give:
Prince Fielder
Mike Adams

For:
Roy halladay
Yu Darvish
Carlos Pena

What you think? My gut tells me I am not getting enough back.

Here's my roster and league specs:

12-team, H2H, 6x6 league (R, HR, RBI, SB, AVG., OPS. for hitters, and W, SV, K, Holds, ERA, WHIP for pitchers).

Keeper league, we keep 4:

C - Buster Posey
1B - Prince Fielder
2B - Jason Kipnis
3B - Ryan Roberts
SS - Hanley Ramirez
OF - Ryan Braun
OF - Curtis Granderson
OF - Shin-Soo Choo
Util - Nolan Reimold
B - Dustin Ackley
B - Mike Trout
B - Bryce Harper
DL - Mike Morse

SP - Adam Wainwright, Tommy Hanson, Daniel Hudson, Matt Garza, Brandon McCarthy
RP - Huston Street, Mike Adams, Fernando Rodney, Brett Myers, Henry Rodriguez

[Thursday]

Nothing? Leave a link if you help, ill be sure to help in return.