How do you know you'll get lucky 4 times? Once to unlock each of the 2 cores, have them stable, and be able to overclock? You can't count on being able to do that.
You'll be MUCH better off getting a Phenom II X4 940 or X4 955 with a HD 6950 2GB video card.
I already got phenom ii x2 and i tested the overclock with prime and it was stable for 48 hours,i geuss i ll get the 6950 cause i could unlock it and save money