A little help please?

I've been doing some research and figured that the best way to go is to build my own computer instead of buying pre-built. So I've been on Newegg looking and these are the system specs that I think I want. Are there any glaring problems or places that should be upgraded/downgraded like the power supply or motherboard or anything? Any help would be much appreciated.

SAMSUNG 20X DVD±R DVD Burner Black SATA Model SH-S203B - OEM

COOLER MASTER Mystique RC-632S-KKN1-GP Black Aluminum/ SECC ATX Mid Tower Computer Case

Seagate Barracuda 7200.10 ST3250410AS 250GB 7200 RPM SATA 3.0Gb/s Hard Drive - OEM

GIGABYTE GA-MA790FX-DS5 AM2+/AM2 AMD 790FX ATX AMD Motherboard

XFX PVT88PYDQ4 GeForce 8800GT 512MB 256-bit GDDR3 PCI Express 2.0 HDCP Ready SLI Supported Video Card

Thermaltake Purepower W0100RU ATX 12V 2.0 500W Power Supply

G.SKILL 4GB(2 x 2GB) 240-Pin DDR2 SDRAM DDR2 800 (PC2 6400) Dual Channel Kit Desktop Memory ModelF2-6400CL5D-4GBPQ

Intel Core 2 Duo E6700 Conroe 2.66GHz LGA 775 65W Dual-Core Processor Model BX80557E6700

(I have no idea what half of those numbers mean)

What about this motherboard?

GIGABYTE GA-P35C-DS3R LGA 775 Intel P35 ATX Intel Motherboard

What about this motherboard?

GIGABYTE GA-P35C-DS3R LGA 775 Intel P35 ATX Intel Motherboard

ToadFoster

Also just wondering if the processor comes with a cooler, or do I need to get that separately?ToadFoster

It's a retail box, so it will come with a cooler.

Well I was going to get the Q6600 that serbsta69 recommended but is the E6850 a faster CPU? And yes this is my first build but I will have a friend who has built a computer or two with me.ToadFoster

In that case I would get the Q6600, if it's not a retail box (with cooler) then I would add a Artic Cooling Freezer Pro 7. It's cheap and works better than stock. It's also not hard to install. Cheers !!

P.S. I checked and the Q6600 is a retail box, so it will have a cooler.