Need help with compatability/upgrades!

[Navilus]

I'm building a new computer, and here I'm going to list links to what I have selected so far, as I'm 80% sure that they're compatible with eachother. I don't consider myself computer savvy so I'm begging for some help in being completely sure in this.

Also, for the mobo I chose, I'm wondering if I should get something better with more PCI slots - it only has one. I might go dual 8800GTXs too - would the 700w power supply be able to handle it all?

Here it is:
case
Newegg.com - Antec Performance One P180 Silver cold rolled steel ATX Mid Tower Computer Case - Retail

mobo
Newegg.com - ABIT AN9 32X Socket AM2 NVIDIA nForce 590 SLI MCP/SPP 190 ATX AMD Motherboard - Retail

vidcard
Newegg.com - BFG Tech BFGR88768GTXOCE GeForce 8800GTX 768MB 384-bit GDDR3 PCI Express x16 OC HDCP Video Card - Retail (might get two of them, would I have to get a different power supply or mobo in order to do it?)

powersupply
Newegg.com - OCZ GameXStream OCZ700GXSSLI ATX12V 700W Power Supply 100 - 240 V - Retail

amd processor
Newegg.com - AMD Athlon 64 X2 5200+ Windsor 2.6GHz 2 x 1MB L2 Cache Socket AM2 Processor - Retail

ram
Newegg.com - G.SKILL 4GB(2 x 2GB) 240-Pin DDR2 SDRAM DDR2 800 (PC2 6400) Dual Channel Kit Desktop Memory - Retail

HDD
Newegg.com - Western Digital Caviar SE16 WD5000AAKS 500GB 7200 RPM 16MB Cache SATA 3.0Gb/s Hard Drive - OEM

optical drive
Newegg.com - NEC Black 18X DVD+R 8X DVD+RW 8X DVD+R DL 18X DVD-R 6X DVD-RW 12X DVD-RAM 16X DVD-ROM 48X CD-R 32X CD-RW 48X CD-ROM 2M Cache E-IDE / ATAPI DVD Burner - OEM

soundcard
Newegg.com - Creative 70SB046A00000 7.1 Channels 24-bit 192KHz PCI Interface Sound Blaster X-Fi XtremeGamer Fatal1ty Professional Series - Retail

I am grateful for ANY advice anyone can offer whether it be regarding something I should upgrade or something I did wrong.

 

[Crom]

First, be aware that the P180 is a tight fit. Using all that and the possibility of SLi 8800s means you'll have no room afterwards. Since you don't seem worried about bling on your case, I'd look into a few others. The Cooler Master Praetorian or the Thermaltake Tsunami are nice roomy case. The Cooler Master Centurion 5 is always there also. It's cheap in price, but it's gets great reviews.
I'd also look into a different MoBo personally. That ones overpriced for what it's got. Check out the ASUS M2N series, mostly likely the Deluxe SLi one.

-Crom