You literally had the same build I had before I updated mine LMAO Besides the HDD and memory brand. Are you me from the past?
Processor: AMD Phenom II X4 965 Black 3.4GHz Quad-Core Processor ($89.99 @ Newegg)
Motherboard: Gigabyte GA-78LMT-S2P Micro ATX AM3+ Motherboard ($49.98 @ NCIX US)
Memory: GeIL Pristine 8GB (2 x 4GB) DDR3-1333 Memory ($32.99 @ Newegg)
Storage: Seagate Barracuda 500GB 3.5" 7200RPM Internal Hard Drive ($54.99 @ NCIX US)
Video Card: XFX Radeon HD 7850 2GB Video Card ($194.99 @ NCIX US)
Case: Raidmax Atlas ATX-295WB ATX Mid Tower Case ($52.99 @ SuperBiiz)
Power Supply: XFX 550W 80 PLUS Bronze Certified ATX12V / EPS12V Power Supply ($49.99 @ NCIX US)
Optical Drive: LG GH24NS90 DVD/CD Writer ($15.99 @ Newegg)
You can change anything on mine besides the processor, motherboard, RAM, and graphics card since they're essential for gaming.
Uhm I'm pretty sure both of ours can handle high-end games, just not on ultra-max settings. Mine (which I'm reccomending for you) can probably handle games better than yours since the graphics card is much better. I sacrificed a little processor power to so I could make the graphics card a bit better while staying around my budget.
Note that a graphics card is more important than a processor when it comes to gaming. Just make sure you have at least a decent processor. What games do you plan to play anyways, like Crysis and Syrim or WoW and Guild Wars 2?