$750~$1000+ Gaming Computer

PURCHASE DATE: More likely in a month or two, so prices will change by then, but I'm just trying to figure out a good system.

BUDGET RANGE: $750-1000

SYSTEM USAGE FROM MOST TO LEAST IMPORTANT: Mostly gaming (towards the current games) , might incorporate some CS3 or CS4 Photoshop.

PARTS NOT REQUIRED: Got a wireless laser mouse, keyboard, 22-in WS LCD monitor (basically need a system and nothing else)

PREFERRED WEBSITE(S) FOR PARTS: newegg.com

PARTS PREFERENCES: I will be using Windows XP SP2 Media Center Edition (32-bit) or MAYBE Windows 7. So I will be getting 4GB RAM (2x2GB) DDR2 or DDR3? AMD mobo with crossfire support (I would prefer one without integrated graphics to save money and HDMI-support if possible, but not important), preferably AMD Phenon II x4 955 Black Edition with ATI Radeon HD 4890 Black Edition.

OVERCLOCKING: Not for now, but I want to in the future. I'm pretty sure my processor and gpu can be OC'ed, but I have no clue for what motherboard to get same goes for my RAM.

Maybe SLI OR CROSSFIRE: No need to with that card.

MONITOR RESOLUTION: 1680x1050 (probably using HDMI cable with 4890 adapter or mobo)

ADDITIONAL COMMENTS: I've been researching and it looks like DDR3 is the better choice over DDR2. Any tips for me?

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First computer build for me so nothing complicated. I don't mind having stock fans, but I do want a good mid-tower/tower with a decent amount of cooling.

Preferred Parts:

AMD Phenom II X4 955 Black Edition
http://www.newegg.com/Product/Product.aspx?Item=N82E168...
$245

ATI Radeon HD 4890 Black Edition
http://www.xfxforce.com/en-us/Features/4890BE.aspx
$250-300 maybe?

Total so far: $500+

More or less I want to focus the cost my system mainly on the CPU and GPU. I'm guessing the break down of the rest would be:

SAMSUNG 1TB 7200 RPM 32MB Cache SATA 3.0Gb/s HDD
http://www.newegg.com/Product/Product.aspx?Item=N82E168...
$84

Sony Sata DVD/CD Burner/Reader
http://www.newegg.com/Product/Product.aspx?Item=N82E168...
$26

Artic Freezer 7 Pro
http://www.newegg.com/Product/Product.aspx?Item=N82E168...
$30

Arctic Silver 5 Thermal Compound
http://www.newegg.com/Product/Product.aspx?Item=N82E168...
$9

Total so far: $660+

RAM:

OCZ Reaper HPC 4GB (2 x 2GB) DDR3 1333 RAM
http://www.newegg.com/Product/Product.aspx?Item=N82E168...
$70

Total so far: $740+

Not sure about RAM, if you guys have any suggestions, please do.

As for the case/PSU/mobo this is where I need help. There are a lot of different mobos compatible with what I want, so it gets confusing. Again, I don't prefer integrated graphics on the mobo, so it will probably go along the 790X or 790FX chipsets. $350 sounds like a good budget for these 3 parts. Maybe $70-100 for the case, $100 for the PSU and $100-150 for the mobo.

Feel free to change my preferences around, I'm open to ideas. Thanks for taking the time to read my post and recommending builds!