Good pc build?

I am looking to build myself a new gaming PC and was wondering if this was a good build for it:

APEX TX-381-C Black Steel Micro ATX Tower Computer Case

-Motherboard:
BIOSTAR A780L3B AM3 AMD 760G Micro ATX AMD Motherboard

-Optical Drive:
ASUS 24X DVD Burner

-Power Supply (PSU):
APEX AL-D500EXP 500W ATX12V Power Supply

-Processor:
AMD Athlon II X3 455 Rana 3.3GHz Socket AM3 95W Triple-Core Desktop Processor

-RAM:
Patriot Signature 4GB 240-Pin DDR3 1333 Desktop Memory

-Storage:
Western Digital Caviar Blue 320GB 7200 RPM SATA 6.0Gb/s 3.5" Internal Hard Drive

-Video Card:
SAPPHIRE Radeon HD 6570 1GB DDR3 PCI Express 2.1 x16 Video Card

Let me know what you think.