Cody Ross is the best pickup; he could be a cheap source of 25 home runs and 90 RBI in the heart of the Florida lineup.
Wigginton always exceeds expectations, and is a very versatile player than can play a lot of positions and give you a power boost.
Rauch could be in line for a few saves in Arizona, since he had success with the role in Washington.
Arroyo can be a good strikeout pitcher and get his fair share of wins, while Sonnanstine is more of a control pitcher to help ERA/WHIP plus the win column.
Another one to earmark is Kawakami. If he plays well he could end up being a decent starter.
If you had to pick one go with Ross. He will be Chris Young with fewer steals and a better batting average.
Do Ross and Wigginton have full time gigs this year or are they part of a platoon? Forget about who I'd be dropping, I just need to rank those players in case I do want to make an add/drop.
Ross will start in right field. Wigginton looks like he will move around the field a lot and DH, but I'd expect he'll get his 400-450 at bats on a strong Orioles offense.