McCown is a good choice, but could go either way. Dennis Green loves to pass the ball, and he'll have three good receivers once Bolden returns, but he could also fall flat on his face.
My homer pick is Kyle Boller. Wait...hear me out...

. He now has two receivers that can catch the ball in Kevin Johnson and Travis Taylor, plus the best TE in football in Todd Heap, plus Devard Darling who is supposedly tearing up training camp, plus Jamal Lewis, plus the best QB coach in football in Jim Fassell teaching him. Depending on what happens with Jamal and how he develops, he could put up a fair amount of offense.