I'll be using Windows 7, Radeon 5870, and an AMD Phenom X4 Processor.
The last two pieces to the puzzle are whether the 965 is worth the $16 over the 955?
And finally I need a solid MoBo for the above build. Has to be under $150. I will not be doing any SLI or CF stuff. Very minor OC if I learn how. I don't presently have any need for 3.0 USB but I am a fan of future proofing.
Most people would say that the 965 is not worth the extra money over the 955. Even if you don't intend to overclock, you can go into the BIOS and up the CPU multiplier on the 955 by 1, and it should match the speed of the 965.
If you're not doing CrossFire, this MSI 870A-G54 for $100 (with free shipping) should be more than adequate. There are similar Gigabyte and Asus motherboards for a little bit more, if you have a brand preference and don't mind spending $5-10 more.
In general, the build looks good. I don't know much about that OCZ power supply, I do know that for a few dollars more, the OCZ ModXStream Pro 600W is pretty decent, or the Seasonic SS-550HT should be good as well.
Actually, the entire ModXstream series sucks. Don't get it.
Looks fine, though I might consider a GTX 470 depending on how much you're getting that 5870 for. How much do you think you'll overclock, as the x6 CPUs overclock much better than the x4s, and are still a better deal from a pure value standpoint. How long will you be keeping this computer for?