This is my first build and I need some expertise to help make sure everything is compatable and I'm not missing out on basic improvements. My current computer is about 8 years old and, with SC 2 coming out, I definitely need to replace it. I'm looking for something that will run games reasonably well for the next few years and has room to upgrade. My target budget is around $1,000.
Buy full version of Windows 7 Pro 64-bit, it cost more but worth it in a long run. OEM has limited activations (and it is cheaper because of that) and MS will give you a hassle/refuse to activate if you keep putting it on different PCs. If you buy full version you will be able to install it on every future PC you own.
I had this same issue on an OEM - I put it on a 2nd computer and it says not authenticated on the bottom. However, my main computer I put it on works fine which is my gaming computer and all that I really care about. The one with the non-authenticated version still works fine tho.
You should get the 955 instead, as the 965 is just a factory OCed 955, you just have to up the multiplier on the 955 to make it a 965. Even without doing that the price difference doesn't really justify the frequency difference.
I'm not convinced about using a 'green' drive as a boot drive, as you lose performance/speed compared to a performance drive, while saving an insignificant amount of power. I would recommend either the Samsung Spinpoint F3 or Seagate Barracuda 7200.12.
As for GTX 460 vs 5850. I'd suggest checking for specific benchmarks of games that you're very interested in playing, and see if one is significantly better than the other. Otherwise the 5850 has the benefit of being able to be crossfired on an AMD build, whereas SLI is not supported.