If he's a full time DH I think it's reasonable to expect more than 20 HR. He has been able to hit 20 HR in each of the last two years while catching and battling injuries. In the last two years he's played 129 and 113 games respectively. Being a full-time DH would give Piazza a legitimate opportunity to play in 140+ games. Piazza is a great pick for catcher IMO as long as he's a full-time DH (or catching sparingly).
Maine has a good swing for a pitcher but on anything that moves, he has no chance. And if it's a fastball, it has to be up in the zone. Basically, the pitcher has to hit his bat. - Mike Pelfrey