Rock was the easy pick, so it's between Jen and Bonnie and I think it's pretty much a toss up, but Jen screwed up a little during her last service so that might've sent her packing.
Rock is gonna win b/c I just can't see Bonnie running the kitchen w/o breaking down emotionally. Rock, even with his temper, at least always get things done. The only way I can see Rock lossing is that he's stuck with a crappy team. That's exactly how Virginia lost last season, by picking two guys who can't cook and one guy who wouldn't cook for her unless she gives him money.
This should be an interesting finale, but I'm sure Rock wins it.