I need some help building a budget gaming PC.

I do plan on upgrading in future as well.

A monitor, speakers, keyboard, and mouse do not need to be included since I already some those.

My budget is: $700 USD

Well I've been thinking about builind a new rig (for gaming) and this is what I have. I was wondering if I should change/add anything.

COOLER MASTER Centurion 534 RC-534-KKN2-GP Black Aluminum & Mesh bezel / SECC Chassis ATX Mid Tower Computer Case - Retail

APEVIA CF12SL-UBL 120mm Blue LED Case Fan - Retail

EVGA 122-CK-NF66-T1 LGA 775 NVIDIA nForce 650i Ultra ATX Intel Motherboard - Retail

EVGA 320-P2-N811-AR GeForce 8800GTS 320MB GDDR3 PCI Express x16 HDCP Video Card - Retail

MSI TurboStream 600W ATX 12V V2.2/ EPS 12V/ BTX 600W Power Supply - Retail

Intel Core 2 Duo E6600 Conroe 2.4GHz LGA 775 Processor Model BX80557E6600 - Retail

CORSAIR XMS2 2GB (2 x 1GB) 240-Pin DDR2 SDRAM DDR2 800 (PC2 6400) Dual Channel Kit Desktop Memory Model TWIN2X2048-6400 - Retail

Seagate Barracuda 7200.10 (Perpendicular Recording) ST3250620AS 250GB 7200 RPM SATA 3.0Gb/s Hard Drive - OEM

Acer AL1716BBD Black 17" 8ms DVI LCD Monitor - Retail

LITE-ON 20X DVD±R DVD Burner with LightScribe Black SATA Model LH-20A1L-05 - OEM

Creative Sound Blaster X-Fi XtremeGamer 7.1 Channels PCI Interface Sound Card - Retail

Creative SBS380 12 Watts 2.1 Speaker - Retail