theyohan :
I have a Phenom ii X4 965 and a GTS 250. Are any of them bottlenecking each other?
Technically no nothing there is "Bottlenecking" anything. The GPU requires information from the CPU but the CPU doesn't really care what the GPU is doing.
Your CPU is more than fast enough for that GPU so you could if you want upgrade your Graphics card.
At your resolution i would be looking at the HD 6850 or the GTX 560 (not the Ti ) which is due out very soon.
The 6970 is out soon as well Thursday in fact so it could pay to see both reviews first then take a pick of those two.
Mactronix