Should i trade matt holliday, jeff nieman and john lackey for billy wagner, carlos marmol, and vernon wells?

Absolutely DO NOT make this trade. Matt Holliday is proven every year, and he's just starting to get hot. There's no way vernon wells is going to keep up his production. John Lackey, also proven, and primed to turn around his bad luck in the second half. Jeff niemann is one of the best pitchers in the AL right now on a team thats going to bail him out of bad starts. Don't do it, you'll regret it.