Ugh, the dreaded catcher position.
Is Charles Johnson available? His road stats are awful, but his home stats are pretty good. Check out the splits:
home: .324, 7 hrs, 31 RBI, 1.006 OPS
away: .137, 3 hrs, 7 RBI, .455 OPS
So starting him at home seems okay, but then you'll need another catcher to plug in when the Rockies leave the mountain air. And using two spots for a catcher is frustrating. You could just pick up whomever has a good matchup that week (e.g., look for teams playing againt Detroit, Tampa, Cleveland, etc.), but that obviously isn't an ideal solution.
You might also check out Toby Hall. He's nothing great, but he plays somewhat regularly and he has plenty of potential (or so they say...).