Buy HD 6750 @ 6K, You'll be able to turn almost all features on all games at this resolution. HIS H675F1GD Radeon HD 6750 1GB 128-bit GDDR5 PCI Express 2.1 x16 HDCP Ready CrossFireX Support Graphic Card with Eyefinity
while the 6750 is a capable card, Id suggest you spend a few hundred more and get the HD 6770. Its available for less than 7k I read on some other thread.
For a little more horse power and future proofness get the HD 6790.
@OP sell off your current PSU as ico has pointed out. Your PSU is an extreme series CM which are known for their bad quality and time-bomb qualities. Add the money you get from selling the PSU to your budget.
Then get this
FSP saga II 500W @ 2.2k
HIS HD 6790 @8.2k
I don't think you requires that much of power. That Seasonic PSU can be used for a GTX 580 SLI with decent overclocking of all the components. Get a TX 650V2 or SeaSonic SS-750JS 750W 80 PLUS PSU @ 5.4K.
Oh I thought OP had a combined budget of 10k.
Anyways OP for 10k the best GPU you can get is the MSi HD6850 Cyclone OC @ 9.5k or if you are willing to push a little then get the Zotac GTX 560(non Ti) @ 10.5k
^^ that gfx card is really cheap but it has only 1 year warranty so it's better to get cards like HD6670 with 3 years warranty and when OCed it can perform better
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