If you want more FPS in games your best option is SLI if you can or go to a 2gb card. If you want improved load time you could go for a SandForce 2000 based SSD, however this shouldn't make much difference to FPS. As for memory I would suggest Corsair, Mushkin, Kingston, or OCZ.
Your other parts are more then sufficient they aren't much of a bottleneck.
For a little perspective my machine and WEI numbers.
Primary Windows Machine:
Intel i7-970 3.2Ghz Hexa-Core
24gb Corsair Vengeance DDR3-1600 Triple Channel
Asus Sabertooth X58
2x Corasir F80 80gb RAID0 (Windows 7 Ultimate x64)
2x Western Digital RE4 500gb RAID0 (Steam)
2x Western Digital GP 3TB SATA3 RAID0
1x Western Digital GP 500gb
1x Western Digital AV 320GB
Radeon 6950 (2gb)
3x 1080 LCDs Eyefinity