4 gigs is enough for gaming.
McCrae, getting a better psu later is money wasting. Do like I did, get a 1000 watt quality PSU. ( I have a Silverstone. )
If you're just gaming, get an i5 2500k, and a gigabyte ud mobo with gskill 4 / 8 GB kit.
And get a better case ( HAF 922 / 932, Coolermaster...