While this card only has 1 cooling fan vs the two that the MSI has, the design should be taken into consideration. The card sucks in air in the front and exhausts the hot air out the back While the MSI has just two fans that blows air everywhere - horrible for smooth air flow. I can vouch for the EVGA version because I have recently upgraded from a 6850 1GB to the EVGA 660 2GB and noticed a significant FPS improvement while maintaining similar temperatures with significantly reduced fan noise.
As for your PSU, unfortunately.... I would have to say it's not realistic to run a 660 and a Phenom II 965 in the same system:
Phenom II x4 965SE = 125Watts [TDP]
GTX 660 = 140Watts [Max Power Draw]
Your at 265 watts already for just the PSU and CPU, leaving just 135 watts for the Motherboard, fans, ram, HDD and optical drive. While it may be doable on a quality 400watt PSU, but generally speaking that's too risky.
I would recommend you to get at least a 550W Corsair Enthusiast Series Power Supply. While a 650watt version is recommended.