Upgrading gaming pc for <$1000.00! Help!

APPROXIMATE PURCHASE DATE: July

BUDGET RANGE: under $1000.00

SYSTEM USAGE FROM MOST TO LEAST IMPORTANT: Gaming, what else is there?!!

PARTS NOT REQUIRED: Keyboard, mouse, monitor (LG 246wp), Video Card (Sapphire ATI Radeon 5870 1gb), Speakers, dvd-rom, case (Silverstone SST-TJ07), cables, thermal paste, etc...

PREFERRED WEBSITE(S) FOR PARTS: Newegg.com

COUNTRY OF ORIGIN: U.S.A.

PARTS PREFERENCES: Intel preferred, but would consider AMD

OVERCLOCKING: Yes if it's simple.

SLI OR CROSSFIRE: Yes, with 2nd Radeon 5870 in future

MONITOR RESOLUTION: 1920 x 1200

ADDITIONAL COMMENTS: I am upgrading my current rig and am needing some advice on what components to purchase to future-proof my pc for games coming in the next year+. I plan on installing Windows 7 now, and Crossfiring another Radeon 5870 in the distant future. I do about 99% gaming, and 1% everything else on this rig so I want to keep it strictly performance. Lastly I have about $800-$900 +/- to spend on this. Id like to TRY and keep it as low as possible, but I could go that high if it was well worth it.

Here is my current rig and what I have been considering upgrading to:

Mobo: Gigabyte GA-P35-DS3R > GIGABYTE GA-X58A-UD3R $190.00

Ram: Crucial Ballistix (orange) DDR2 800 ( 4 gigs) > CORSAIR XMS3 6GB CMX6GX3M3C1600C7 OR G.SKILL PI Series 6GB Model F3-12800CL7T-6GBPI $160.00 - $175.00

CPU: Intel Q6600 2.40 Ghz (not O/C'ed) > Intel Core i7-930 Bloomfield 2.8GHz $290.00

Power Supply: OCZ GXS 700 > CORSAIR CMPSU-750TX 750W $90.00

Hard-drives: Barracuda 7200.10 SATA 3.0Gb/s 320-GB x 2 > SAMSUNG Spinpoint F3 HD103SJ 1TB 7200 RPM x1 $70.00

OS: Windows Vista 64 Home Prem > Windows 7 Home Prem $99.00

Cooler: Thermalright 120 > Can I continue to use my Thermalright 120 seeing as the core size for my old cpu and new cpu are both 45nm or is that not possible? If not, what are some thoughts? $60.00-$80.00

Video Card: ATI Radeon Sapphire 5870 1gb (going to keep this, just bout it 4 months ago)

Sound Card: Auzentech Prelude (going to keep and/or goto on-board sound)

Total so far is around: $990 AR/Shipped from Newegg.com If we can save some money and cut corners that will not have any serious adverse consequences on the total upgrade, I'm ALL for hearing them.
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If you're shopping in the US, and you're interested in high-end CPU's, find out if you have a Microcenter near you. They have i7-930's for $199 in some areas. That'd be a great way to ensure you have a solid build for several years.