Is my graphics card the only bottleneck in my system??

Stop throwing the word bottleneck around, your not using it right. The CPU is mostly the one that holds the GPU back. In this case it's not. It just that Crysis is the most graphic intense game out there at the moment. Theres a video somewhere on your tube that has tri SLI gtx280's and the game can barely hit 60 FPS, its always in the mid 30's to the 50's. You can run any other game perfectly fine, the 8800 GTS is a beast and the 8800 GT also is too. They can run anything on high these days EXCEPT for crysis. Crysis is used for more benchmarking than gaming... You can probably run anything coming out in the next few years on medium-very high. If thats not enough for you then get crossfire 4870 or a 4870 X2 is you have a high monitor res. That one should last you quite a bit. Make sure you get a crossfire motherboard if your getting the ATI cards and plan to crossfire.