New Build Going With AMD Again Which CPU & GPU?

I love to game and have been running SLI since it first come out on the 939 platform. With no new AMD DDR3 SLI boards now or being released in the near future it looks like I'm going to drop Nvidia. I love there cards and SLI but I'm not going to support the darkside (i7/X58). Plus Nvidia's greed didn't help this time.
With that said I have picked out the following parts so far with a decent budget this time. $2000

Motherboard: ASUS Crosshair III Formula AM3 AMD 790FX http://www.newegg.com/Product/Prod [...] 6813131392
Ram: CORSAIR DOMINATOR 4GB (2 x 2GB) 240-Pin DDR3 SDRAM DDR3 1600 http://www.newegg.com/Product/Prod [...] 6820145249
Power supply: CORSAIR CMPSU-750HX 750W http://www.newegg.com/Product/Prod [...] 6817139010
SSD Drive: Corsair CMFSSD-256GBG2D 2.5" 256GB SATA II MLC Internal Solid state disk http://www.newegg.com/Product/Prod [...] 6820233085 With ICY DOCK 2.5" to 3.5" SSD & SATA Hard Drive Converter http://www.newegg.com/Product/Prod [...] 6817994064
Going to use Windows 7 Ultimate as the OS when it comes out.
I'm using my old case LIAN LI Lancool PC-K10B http://www.newegg.com/Product/Prod [...] 6811112155 which has this side panel with the optional duct and fan set. http://www.performance-pcs.com/cat [...] s_id=20301 I'd should be fine on cooling.

Also I'm going keeping my two sata WD 500GB drives as storage, and my sata Samsung S223 burner. No need to go Bluray here.

Here is were I'm getting stumped. There is two Phenom II's I'm looking at.
1. AMD Phenom II X2 550 Black Edition Callisto 3.1GHz http://www.newegg.com/Product/Prod [...] 6819103680
2. AMD Phenom II X4 955 Black Edition Deneb 3.2GHz http://www.newegg.com/Product/Prod [...] 6819103674
I can afford either one. I overclock between 5% and 8%. which would give me the best preformance?

I'm a gamer so I'm going to run crossfire right away. Which cards would work best for me the HD Radeon 4890, 4870 and which company to go with? This is really the million dollar question because I have never used an ATI product.

So any help would be appreciated.

"I'm not going to support the darkside (i7/X58)"

Nice one there.

You got a lot of budget there so go with x4.

SAMSUNG TOC T240 Rose Black 24" 5ms HDMI Widescreen LCD Monitor 300 cd/m2 DC 20000:1(1000:1) and it's resolution is 1920 x 1200. It's only 3 months old. I'm leaning toward something with a better cooling for a GPU. SAPPHIRE Vapor-X 100269VXLE Radeon HD 4890 1GB seems to be what I'm looking for. I'll overclock um myself. Thanks Outlander for the tip.

Also thinking of bumping the power supply to the 850 watt model. I never skimp on power when it comes to the price and quality.

hunter315 I see in your configuration your using GSkill ram. How good is it with timings? I tried OCZ on this current build and had nothing but problems so I switched back to Corsair, but I'm open to try something else.

Going AMD Phenom II X4 955 Black Edition Deneb.

Anyone have a good idea on a better heatsink and fan than the ARCTIC COOLING Freezer 64 http://www.newegg.com/Product/Prod [...] 6835185125 which I have used on my last two builds?

for the brand of graphics card, i would go for XFX