STAY AWAY FROM DAVID WELLS!
Do your research! His back is not 100% and he missed a start for it. You are giving up the most durable outfielder who doesn't get hurt. He will hit you about 50HRs and bat over .300 Helton will bat about .320 and hit you 40hrs. However, David Wells might be on the DL before the end of the week.
Percival and the Angels are hot. Percy is a STUD closer. You are trading 2 STUDS for 1 STUD and a decent pitcher with injury problems that wins b/c he pitches for the best offensive team in the majors.
If you want to improve your staff, find a pitcher that is 100% healthy!
DO NOT DO THIS TRADE!