I would rather Swisher over Abreu for the power upside alone, and I would use the waiver to pick him up. He's had 29 HRs and 80+ RBIs in the past two years - I would take the risk he breaks out of the drought soon enough. I also own him so I hope I'm right! I would drop Lewis as your SP staff is solid without him, and you could play Posada either regularly or when Napoli is sitting.
Solid team you have there!