If your planning to use PCI-3.0 the Intel i3 3210 pci-e uses revision 2.0, which i think is odd as the ivy bridge i5 and i7 use 3.0. Ivy Bridge i3 3200 series are good CPUs and fast. Mind you more demanding games like Watch dogs will work quite a bit better on a Intel quad core processor ie: i5, i7, Sandy bridge and newer....Anyway more to the point you can still game with an i3 3220. And I imagine You could use a R9 270x or GTX 760 or GTX 660 with the CPU not holding the one of the graphics cards back. Mind in CPU bound scenarios you may get a bit of a hit on Mid-to High range graphics card. but If your buying a Graphics card do not aim low. Get the absolute best GPU you can afford. PSU is another one to get the best you can afford as well, I am not saying go and buy a AX1200i or even HX850 but aim for 600w from a quality vendor ie: Seasonic,Corsair, Coolermaster, ect. You can get a better CPU later if you feel it is needed.