Whatever happened to easy questions?
Ok, the right answer here, even if it's kind of hedging the question, is: whoever you can get the most for. These three are that close.
But fine, that's too easy. If you had asked before the season, I would have said Clemens. Now, however, I actually like Clemens most. Wood and Vazquez will have more trouble picking up wins, Wood is allowing too many walks for my taste (although he's often unhittable), and Vazquez isn't getting as many strikeouts as he should. It's still extremely close, but if I had to lose one, it would be Wood, simply because I like to steer clear of sinking k/bb ratios.