What is the best possible GPU with this CPU?

[Omni2K12]

Howdy,

I'm looking to postpone getting a brand new gaming PC for a year or so by upgrading various components of my 3,5 year old rig.

Specs:

Core 2 Duo E8500 @ 3,16 GHz (Stock)
2x 500GB SATA 2 HDD Western Digital
1x 64GB Samsung 830 SSD
2x4 GB Corsair DDR3 1600 Mhz RAM
Asus P5Q3 Deluxe Wifi/@P
750W Corsair PSU
EVGA Geforce GTX 260 Core 216 896MB GDDR3
Antec P182

As you can see I have a decent graphics card, but I do want some more fps in games like BF3. My question is simple: What is the best possible GPU that I can upgrade this system with that my CPU will not be (or at least not much) bottlenecking?

Thanks.

 

[sosofm]

6870 is good. 560Ti is a good upgrade if you overclock your CPU.

 

[Rockdpm]

My Recommendation. Is a GTX 560 ti. prices should be decent. Or if you can hold off for a week or two. the Kepler cards should be out shortly. and a Low End card should be on par with performance for a decent price with more Vram