Upgraded to SLI video card recommendation.

[Hammerxc]

I am looking for experienced/knowledgeable suggestions for upgrading my Graphics solution.

BUDGET: While I'm not Bill Gates, I'm not looking for a nickle solution.

GOAL: I'm looking for the best performance I can achieve for a REASONABLE/OBJECTIVE price. I put approx $2,300 in my current system (paid someone to put it together and warranty it. Full tower).

I play games for recreation, but do like to enjoy as high performance as I can, for my budget.

My current system is composed of:

Processor 3.20 gigahertz Intel Core i7 920 (overclocked)

Main Circuit Board EVGA 132-BL-E758 Tylersburg

Graphics (SLI) NVIDIA GeForce 9800 GTX/9800 GTX+ [Display adapter] (2x)

Monitor DELL U2410 [Monitor] (24.0"vis, s/n XX-0C592M-XXXXX-086-HGEL, August 2010)
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Current games I play:

Left 4 Dead 2
Just Cause 2

Interested in playing:

Rage

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I use to read enough computer/hardware websites/articles that I had a handle on the hierarchy of graphics cards and their performance, but have fallen out of touch. I don't know what provides pennies more performance for dollars, and vice versa.

I'm looking for 2 cards that will work with my current systems SLI.

Thanks in advance.

 

[Hammerxc]

I am flexible, but would like to keep it to $325 or so per card (2 card SLI).

Any differences in GTX 570 cards to either look for, or look to avoid?