I'd still take Bumgarner. I love Detwiler, but Bumgarner could be a #2 starter in the big leagues, which Ross won't ever be.
Detwiler's ceiling is a 2/3 and he's closer to reaching it. But this is a debate with reasonable and educated positions on both sides. Dewiler >> Aumont though, and a few of the other guys drafted around him.
Is Vitters ever going to do anything?