Building an mATX portable gaming system. Please rate :)

I dont plan on overclocking anything other than unlocking the 2 other cores on the X2. Please keep that in mind if you recommend any changes.

APPROXIMATE PURCHASE DATE: Now, started today, buying the rest next week.

BUDGET RANGE: about 1000

SYSTEM USAGE FROM MOST TO LEAST IMPORTANT: Gaming, Streaming movies, school

PARTS NOT REQUIRED: None

PREFERRED WEBSITE(S) FOR PARTS: Newegg and microcenter

PARTS PREFERENCES: none

OVERCLOCKING: No

SLI OR CROSSFIRE: Crossfire

MONITOR RESOLUTION: Any

ADDITIONAL COMMENTS:
I just purchased today:

ASUS EAH5850/G/2DIS/1GD5 Radeon HD 5850 1GB 256-bit GDDR5 PCI Express 2.0 x16 HDCP Ready CrossFire Supported Video Card w/ATI ... - Retail(they have it in stock!)
http://www.newegg.com/Product/Prod [...] 6814121349

APEX TX-381-C Black Steel Micro ATX Tower Computer Case - Retail (Case with great feedback)
http://www.newegg.com/Product/Prod [...] 6811154094

DFI LP JR 790GX-M3H5 AM3 AMD 790GX HDMI Micro ATX AMD Motherboard - Retail(I went with this board because it can support 2 PCI-E cards 8x/8x...the difference from a 16x/16x crossover is very minimal and it uses DDR3)
http://www.newegg.com/Product/Prod [...] 6813136068

GELID Solutions FN-SX09-15 92mm Case Fan - Retail

GELID Solutions FN-TX12-15 120mm Case Fan with Superior Temperature Control - Retail

Im going to pre build this part to find out what kind of CPU cooler will fit properly, probably buy it from a local store so I can visually see it fit.
Next week Im going to finish it out by purchasing:

CORSAIR CMPSU-750TX 750W ATX12V / EPS12V SLI Ready CrossFire Ready 80 PLUS Certified Active PFC Compatible with Core i7 Power ... - Retail(This is a great PSU that can support 2 of the newer crossfireX cards.. enough Amps and Watts)
http://www.newegg.com/Product/Prod [...] 6817139006

AMD Phenom II X2 550 Black Edition Callisto 3.1GHz Socket AM3 80W Dual-Core Processor Model HDZ550WFGIBOX - Retail(You can unlock the 2 other cores to make it a x4 very easily!)
buying from Microcenter, they have it on sale for 89.99 and they are a local shop.

G.SKILL 4GB (2 x 2GB) 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800) Dual Channel Kit Desktop Memory Model F3-12800CL9D-4GBNQ - Retail
http://www.newegg.com/Product/Prod [...] 6820231193

Western Digital Caviar Blue WD5000AAKS 500GB 7200 RPM SATA 3.0Gb/s 3.5" Internal Hard Drive -Bare Drive - OEM
http://www.newegg.com/Product/Prod [...] 6822136073

i-rocks RF-6572-BK Piano Black 2.4 GHz RF Wireless Slim Keyboard/Mouse Combo w/ Travel Pouch - Retail
http://www.newegg.com/Product/Prod [...] 6823204012

LG 22X DVD±R DVD Burner Black IDE Model GH22NP20 - OEM
http://www.newegg.com/Product/Prod [...] 6827136144

Monitor wise, Im still researching. Just looking for an inexpensive 22-23' LCD under 150.

Thanks