My first computer build

[The Farmer]

Alright, so I'm asking YOU, the tech wizards (and whatever the feminine form of wizard is (unsure if it's witch)) of Chief Delphi, for some advice on my first desktop build. I have the parts selected, but not ordered yet. What I want to know is the compatibility of the parts I have selected, and I figure that this was an adequate place to ask if they are compatible. I already have some components, so I'll list those first:

OS: 64-bit version of Vista

Monitor: Acer H213H 21.5" widescreen LCD monitor

Mouse and keyboard: Microsoft Wireless Media Desktop 1000

The parts I'm getting (from newegg)

Case: Antec Nine Hundred Black Steel ATX Mid Tower Computer Case

Hard Drive: Western Digital Caviar Black WD5001AALS 500GB 7200 RPM SATA 3.0Gb/s Hard Drive

Disk Drive: ASUS Black SATA DVD-ROM Drive Model DVD-E818A3T BULK

Sound Card: Turtle Beach RIVIERA 5.1 Channels PCI Interface Sound Card

Power Supply: CORSAIR CMPSU-750TX 750W ATX12V / EPS12V SLI Ready CrossFire Ready 80 PLUS Certified Active PFC Power Supply

Speakers: Logitech S-220 17 Watts 2.1 Multimedia Speaker System

RAM: CORSAIR 4GB (2 x 2GB) 240-Pin DDR2 SDRAM DDR2 800 (PC2 6400) Dual Channel Kit Desktop Memory Model TWIN2X4096-6400C5

Motherboard: GIGABYTE GA-EP45-UD3P LGA 775 Intel P45 ATX Intel Motherboard

CPU fan: ZALMAN 9500A 92mm 2 Ball CPU Cooler

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

Video Card: SAPPHIRE 100265L Radeon HD 4830 512MB 256-bit GDDR3 PCI Express 2.0 x16 HDCP Ready CrossFire Supported Video Card

I'm fairly certain that these are all compatible, however, my knowledge is limited when it comes to the subject of computer building.

P.S. This comp is going to be only for gaming, and perhaps CAD, but just that.