It is really hard to make predictions since we don't know what the layout will be....but here is my best guess.
I honestly don't think any of the guys in the division can beat Forrest Griffin or Bobby Southworth. However I think Griffin will be the man standing at the end.
Nathan Quarry is a bit of an unknown but believe me he is a MAJOR contender on this show, and has some really good submissions to go along with his hands and wrestling skills. Diego Sanchez is also another guy that has serious skills. Don't know a lot about K Flow other than he is a legit jiujitsu bad ass and I have heard he has some good thai boxing as well.
205 = Forrest Griffin
185 = Nathan Quarry or Diego Sanchez