Now you want to game, you dont need a I7 to game, theres no performance loss between the I5 2500k and I7 2600k at gaming. Its useless to get the I7 if you just want to game. I7 2600k its only a Good Option when you use High render programs .
Get Gskill branded 8 gigs of ram 1600.
If you Choose an I5 like a normal Person for gaming, you can use the money you save to get even a better Videocard.