That is a decent mid-range rig, how much in total are you going to pay for all that?
As of this spec you should probably be able to run Crysis 2 on high settings with 40-50 FPS at a good resolution. And if you want you can add another GTX460 later for SLI, your 750W PSU is strong enough to power 2 GTX460s, so don't worry.
I'd say this is a cost-effective rig, and should be strong enough to play all your games and float all your boats. I have a Phenom II 955 in my rig as well, and it's a good overclocker as long as you have good CPU cooling, as I have mine at 4.0Ghz without breaking much of a sweat, with a cool-looking Zalman 9500A LED CPU fan. I heard the GTX460 overclocks well too, but if you are going to do overclocking AND go with twin GTX460s, you may need about 800W or more of power, just in case.