Please critic my budget gaming build

All these prices are in Canadian...

Case: COOLER MASTER RC-690-KKN1-GP Black SECC/ ABS ATX Mid Tower Computer Case - Retail $100.02
Motherboard: ASUS M3A78 Pro AM2+/AM2 AMD 780G HDMI ATX AMD Motherboard - Retail $124.99
PSU: OCZ StealthXStream OCZ500SXS 500W ATX12V / EPS12V Active PFC Power Supply - Retail $68.81
Video Card: POWERCOLOR AX4830 512MD3-H Radeon HD 4830 512MB 256-bit GDDR3 PCI Express 2.0 x16 HDCP Ready CrossFire Supported Video Card - Retail $137.28
Memory CZ Fatal1ty Edition 4GB (2x2GB) 240-Pin DDR2 SDRAM DDR2 800 (PC2 6400) Dual Channel Kit Desktop Memory - Retail (The Official Memory of the Championship Gaming Series) - Retail $47.78
Cpu: AMD Athlon 64 X2 5200+ Brisbane 2.7GHz Socket AM2 65W Dual-Core Processor Model ADO5200DOBOX - Retail $74.99
Hdd: Seagate Barracuda 7200.10 ST3250310AS 250GB 7200 RPM SATA 3.0Gb/s Hard Drive - OEM $62.49
Dvd Writer: LG 22X DVD±R DVD Burner Black SATA Model GH22NS30 - OEM $28.99

Sub Total: $645.35
Total: $722.79

I'm probably going to stick with this computer for at least 2 years so I'm thinking ahead with the am2+ mb so I can use Phenom 2 later on. I could go with Intel if someone can show me a better build for the same price or less.

I guess I should add what I plan to play with this rig. Starcraft, Wc3, Counter-Strike, TF2, Left4Dead