Help with a new system

I am in the process of building a new system and listed below are the specs so far. I am wondering if all of these are compatible and if you have any suggestions. I am not huge gamer but i want to be able to game if i find a game i like. I am also a big fan of multi tasking and i want a real fast machine. Also i listed the price of each component if you think something is a bit pricey let me know

Thanks
Bill




SAMSUNG 22X DVD±R DVD Burner with LightScribe Black SATA Model SH-S223Q/BEBN - OEM
$27.99

Thermaltake M9 VI1000BWS Black SECC Steel ATX Mid Tower Computer Case
$74.99


Seagate ST3640323AS 640GB 7200 RPM SATA 3.0Gb/s Hard Drive
$89.99


EVGA 512-P3-N801-AR GeForce 8800 GT 512MB 256-bit GDDR3 PCI Express 2.0 x16 HDCP Ready SLI Supported Video Card
$134.99


Creative Sound Blaster SB0570 Audigy SE 7.1 Channels PCI Interface Sound Card
$23.69


OCZ GameXStream OCZ700GXSSLI 700W ATX12V SLI Certified CrossFire Ready Active PFC Power Supply
$114.99


OCZ SLI-Ready Edition 4GB (2 x 2GB) 240-Pin DDR2 SDRAM DDR2 800 (PC2 6400) Dual Channel Kit Desktop Memory Model OCZ2N800SR4GK
$79.99


ECS P45T-A LGA 775 Intel P45 ATX Intel Motherboard
$109.99


Intel Core 2 Quad Q6600 Kentsfield 2.4GHz LGA 775 Quad-Core Processor Model BX80562Q6600
$189.99


ZEROtherm ZEN FZ120 120mm CPU Cooler
39.00

If you're looking to shave off some of the cost, the first place I'd look is the case. You can easily find an Antec case and Antec PSU combo (Antec is one of the only case/psu combo's I'd ever trust) for much less than your case and PSU. That's not saying that either of them are poor choices, but if you're looking to save some money consider...

Antec Three Hundred (free shipping) & Antec NeoPower 650W ($13 shipping)
Combo Deal = $145 + shipping

Antec Sonata III w/ Earthwatts 500w = $132 (free shipping)

I've heard alot of bad stuff about ECS (all anecdotal, but that's enough for me). I'd get either the MSI P45 Neo-F ($90 after MIR), GIGABYTE GA-EP45-DS3L ($100), or ASUS P5Q SE ($105)

Also, unless you're a real audiophile, you'll probably never notice the difference between the onboard sound and the descrete sound card. Save your money, you can always buy it later if you don't like what you hear.