CPU Cooler - Don't forget one. You will need one to overclock and that CPU will need it to be able to stretch its legs...
MEM - The AMD platforms respond well to higher frequency modules. Look toward DDR3-2133 or DDR3-2400 modules.
GPU - The GTX 750 Ti is the same price as that GTX 750.
PSU - Stick with a Tier 1 or Tier 2 unit!
http://www.tomshardware.com/forum/id-2547993/psu-tier-list.html
PCPartPicker part list /
Price breakdown by merchant
CPU: AMD FX-6300 3.5GHz 6-Core Processor ($96.89 @ OutletPC)
CPU Cooler: Cooler Master Hyper 212 EVO 82.9 CFM Sleeve Bearing CPU Cooler ($26.99 @ NCIX US)
Motherboard: Asus M5A97 LE R2.0 ATX AM3+ Motherboard ($71.98 @ Newegg)
Memory: Mushkin Redline 8GB (2 x 4GB) DDR3-2133 Memory ($49.99 @ Newegg)
Storage: Western Digital Caviar Blue 1TB 3.5" 7200RPM Internal Hard Drive ($51.89 @ OutletPC)
Video Card: MSI GeForce GTX 750 Ti 2GB Video Card ($112.99 @ SuperBiiz)
Case: DIYPC Ranger-R4-B ATX Mid Tower Case
Power Supply: XFX 550W 80+ Bronze Certified ATX Power Supply ($58.99 @ SuperBiiz)
Optical Drive: Samsung SH-118CB/BEBE DVD/CD Drive ($18.99 @ SuperBiiz)
Operating System: Microsoft Windows 7 Home Premium SP1 OEM (64-bit) ($88.88 @ NCIX US)
Total: $577.59
With that said, and at $600, you would be better off with...
PCPartPicker part list /
Price breakdown by merchant
CPU: Intel Core i5-4460 3.2GHz Quad-Core Processor ($176.95 @ SuperBiiz)
Motherboard: ASRock H97 Anniversary ATX LGA1150 Motherboard ($72.89 @ OutletPC)
Memory: Crucial Ballistix Sport 8GB (2 x 4GB) DDR3-1600 Memory ($43.99 @ Amazon)
Storage: Western Digital Caviar Blue 1TB 3.5" 7200RPM Internal Hard Drive ($51.89 @ OutletPC)
Video Card: MSI GeForce GTX 750 Ti 2GB Video Card ($112.99 @ SuperBiiz)
Case: Thermaltake Versa H21 ATX Mid Tower Case ($34.99 @ SuperBiiz)
Optical Drive: Samsung SH-118CB/BEBE DVD/CD Drive ($18.99 @ SuperBiiz)
Operating System: Microsoft Windows 7 Home Premium SP1 OEM (64-bit) ($88.88 @ NCIX US)
Total: $601.57