You do not need 16 gig of RAM for gaming . 4 gig is enough . Games simply cant use more
For some future expansion then maybe 2 x4 gig is worthwhile .
Since you have a motherboard that can accept the new bulldozer cpu's that are being released next month you should probably also buy RAM that is compatible with Bulldozer . That means 1.5 volt .
2 x4 gig of 1.5 v [ or less ]
No point buying the 965 phenom either . Its the exact same part as a 955 but clocked 100MHz higher . With an unlocked multiplier you can make that change your self in under 60 seconds