I would agree with chris8: hitters only for awhile, unless a closer run starts (you'll want at least 2 more, but with Gagne, you can afford to wait till later in the run).
Given that, I would take Pierre right off - getting Pierre in what's essentially the 7th round is a steal. Huff's also valuable for the multi-eligibility (1b/3b/of, in most leagues).
If you don't get one of the top tier or second tier C's (say, those two, plus mauer, posada, martinez, varitek) forget catcher and just pick someone up at the end of the draft.) That said, I would go for a SS after getting Pierre or Huff, if you can get a catcher.