If we were to trade for a player I would prefer it to be a good SP or a great CF. I don't see any teams with the CF that we need (lead off and plays CF) so a SP it is!
Span and Bourn are two I'd go after, but I think we should just wait until the offseason to get Bourn.
I would trade for a good catcher right now. I'd take Carlos Ruiz for Lombardozzi and an average prospect, but I don't think the Phillies would trade him to us.