FX 6100 vs FX 4100 vs Phenom II x4 965

I'm building my low budget gaming pc (im a casual gamer, i don't mind lower graphics, I care more about the budget) so the mobo is gonna be an ASUS M5A78L-M LX with 12 gb ram and an Hd 7770, I'm going to be running it in a 23" widescreen monitor. What I'm trying to decide is what CPU to get, I've read that the AMD bulldozer CPU's are trash but they're cheap and that's what I'm aiming for. But for that price range (actually 10 dollars lower) I can get a Phenom II x4 965BE. So what would you advice?