9500 is utter crap, 9800GT minimum for anything half decent. In fact, if you're after bang for buck performance, get the new HD 4860. They're about £80 and will kill anything up to a 9800 GTX while taking very little from the wall (because of the new 40nm GPU).
And the 9500 will support SM3 i would think...
Scrap Kingston, go Corsair.
Try to go Asus mobo if you can, better customer service than Gigabyte.
Not very experienced in Intel CPU's as im an AMD man myself but it seems fine for a cpu, probably good overclocking potential if you're into that sort of stuff.