Upgrading my PC soon, need some help.

[Master g]

Cybermonday is coming soon, so I am trying to find the right parts to upgrade my PC.
I would like to run the following games at MAX settings:
-Witcher 2: Enhanced Edition
-Battlefield 3
-The Unreal Engine
-Any major releases of the next generation

Please, nothing too expensive, as I only work as summer job at a grocery store.

My current specs:
GFX- AMD Radeon HD 6450
CPU- Intel(R) Core(TM) i5-2320 CPU @ 3.00GHz (4 CPUs), ~3.0GHz
8192MB RAM

Thanks in advance!

Edit: Also, I am just looking to upgrade my graphics card and CPU. I've got $300 to spend.

 

[AK139]

a 6450 will not play bf3 even at lowest settings

This is a $430 computer which will still not play bf3 at highest settings but about medium with maybe 1-2 high settings

PCPartPicker part list: http://pcpartpicker.com/p/2cqKm
Price breakdown by merchant: http://pcpartpicker.com/p/2cqKm/by_merchant/
Benchmarks: http://pcpartpicker.com/p/2cqKm/benchmarks/

CPU: AMD Athlon II X4 750K 3.4GHz Quad-Core Processor ($79.99 @ Amazon)
Motherboard: ASRock FM2A55M-DGS R2.0 Micro ATX FM2 Motherboard ($53.98 @ Newegg)
Memory: A-Data XPG Gaming Series 4GB (1 x 4GB) DDR3-1600 Memory ($29.99 @ Newegg)
Storage: Western Digital Caviar Blue 1TB 3.5" 7200RPM Internal Hard Drive ($54.99 @ Newegg)
Video Card: Sapphire Radeon R7 260X 2GB Video Card ($145.38 @ Newegg)
Case: Antec VSK-4000 ATX Mid Tower Case ($34.99 @ Newegg)
Power Supply: Antec Basiq 350W ATX Power Supply ($29.99 @ Amazon)
Total: $429.31
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2013-11-30 23:05 EST-0500)