Looks top notch, the graphics card doesn't really matter weather it's 1GB or 2GB, the main thing is the core and memory clocks on them.
Always good to spend an extra few quid on a power supply, not really something you wanna change for a long time, so when the computers outdated in 7 or 8 years or so, you're still able to cope with that psu. XFX and corsair power supplys are the dogs bolloks, can get a lot of power supplys that rate at say 600w but that's their max output recorded, so normally they can't acutaly run at that spec meaning you can burn stuff out buying cheap psu's. Same thing happened to me a few years ago.
Hope that helps