fantasy bb trade advice

So here's the trade somebody just proposed to me for fantasy bb:

Edinson Vólquez (theirs)

for

Lance Berkman (mine)

Lance is the #1 ranked player, Volquez is #8. And I'm currently fair to middlin' in terms of wins and K's (but doing very well in every other category). Do you think Volquez will continue to pitch well? Berkman had a TORRID start, but I don't see him keeping up the pace for the rest of the season...

>shock<

But...I also have Pujols on the sidelines (currently DL) who could take up Berkman's slack. And Adam Wainwright (and Shawn Marcum) are on the DL for me right now. But Volquez is such a beast...I'm just wondering if his arm will hold up. Still it's a kinda cool blockbuster trade...

I know some of y'all are quite knowledgeable about sports so please suggest away...the trade was just proposed today. I'm kind of inclined to just accept it and let the chips fall where they may. And here's my league if you want to check out what's going on:

http://baseball.fantasysports.yahoo.com/b1/49027

(I'm From a Motel 6)