No your CPU will not bottleneck the gpu. You're fine with that setup.
what about a sapphire hd 7770 ghz 1gb ddr5 edition? i have 2 extra molex plugs on my PSU (which i can use with an adapter to get a 6 pin) and plenty of room in my case. do you think i would run into any problems with that card? be it bottlenecking or power limitations?