I wouldn't make any major deals at this point. I'd look for two things, a good veteran reliever and I'd try and get Amazega as another alternative to the infield situation.
Amazega is a slick fielder, whose fast, and has shown a little bit of offensive potential. I am patietn to finally give Willie Harris a shot where he can get consistent playing time for 3 weeks to a month. Never before has he gotten that and I believe once he gets that, you'll see him get comfortable, get in a groove, and get on base.
For a veteran reliever, I'd look to someone that made a decent some (this would be their contract year) so you wouldn't have to give up much. I'd be tempted to add a 5th starter, but at this point you have to have patience to let the guys you've brought in show what they can do.