Looks like a solid list to me, and yes, you could get by with a 750W power supply without much trouble. In fact, a good one wouldn't have any trouble handling a second HD4870, should you decide to go that route in the future. There are a good number of a solid 750W options, and the Corsair unit is certainly one of them.
Memory-wise, those sticks will have plenty of headroom for any overclocking you might want to do, and shouldn't give you any trouble (or clearance issues with some CPU heatsinks).
Personally, I'd suggest going for an aftermarket CPU cooler, especially for any overclocking. Something like the
NH-U12P SE1366 would be a good option, quiet, and includes two good fans to boot.