The term "bottleneck" gets tossed around too often, imho, and it may prevent someone from getting really neat stuff that would work out just fine.
A bottleneck is either theoretical or practical.
All systems have a theoretical bottleneck. You can think of it as, "a chain is only as strong as its weakest link". In the case of the OP, the cpu is the weakest link; however, that won't create a bottleneck, because it's only a bottleneck in theory. In practice, he will be just fine.
You can mitigate a cpu bottleneck by making the card work harder. Tragically,
, all the OP would have to do is pump up the eye candy. With nvidia being able to render a ridiculous 32xAA, he won't ever experience a true practical bottleneck... of the type that would force him to buy a new cpu.