This is pretty good. I'm fairly new as well so I not going to swear by it but it looks good.
CPU: AMD Phenom II X4 965 Black 3.4GHz Quad-Core Processor ($79.99 @ Newegg)
Motherboard: Gigabyte GA-970A-DS3 ATX AM3+ Motherboard ($69.98 @ Newegg)
Memory: Crucial Ballistix Sport 8GB (2 x 4GB) DDR3-1600 Memory ($67.63 @ NCIX US)
Storage: Western Digital Caviar Blue 500GB 3.5" 7200RPM Internal Hard Drive ($39.99 @ Microcenter)
Video Card: Sapphire Radeon HD 7770 1GB Video Card ($112.98 @ SuperBiiz)
Wireless Network Adapter: Rosewill RNX-N180UBE 802.11b/g/n USB 2.0 Wi-Fi Adapter ($17.99 @ Newegg)
Case: Rosewill Blackbone ATX Mid Tower Case ($31.99 @ Amazon)
Power Supply: SeaSonic S12II 520W 80 PLUS Bronze Certified ATX12V / EPS12V Power Supply ($70.98 @ Newegg)
Optical Drive: Lite-On iHAS124-04 DVD/CD Writer ($17.98 @ Outlet PC)
Keyboard: Lite-On SK-1788/BS Wired Standard Keyboard ($12.98 @ Newegg)
Total: $522.49
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2013-05-24 23:56 EDT-0400)
Comes out to $522.49
EDIT: Someone Somewhere's build will probably be better.
Edit: Changed ram.