For gaming 8Gb is enough. FOr the cpu and motherboard I would drop the FM2 motherboard and CPU as there isn'y much if any upgrade path. If you are really on a budget go for an FX 6300 and a AM3+ board with a 970 chipset(avoid the 960g chipset and any 970 that lacks VRM cooling). This will atleast give you an upgrade path to an 8300 series CPU later. For the PSU drop the CX750 it bigger that you need and the CX series capacitors have longevity issues(they fail earlier than they should). A 550w XFX would be more than enough for a few future upgrades(except crossfire) and is a good quality unit.