Stand pat. You have an excellent team, and you certainly dont need help at Starting Pitching. Brett Myers and Al Reyes as closers is nothing to worry over.
I dont know how many roster spots you have, but you might want to look for great 8th inning type pitchers-people like Capps, Neshek, Soriano, Linebrink come to mind. You can also look at lesser-known alternatives like Soria in KC, Accardo in Toronto, and most recently, Gregg in Florida is who I just picked up.