I had the same budget in my thread. I came to this conclusion here, with the help of many capable forum members:
PCPartPicker part list:
http://pcpartpicker.com/p/Ucj2
Price breakdown by merchant: http://pcpartpicker.com/p/Ucj2/by_merchant/
Benchmarks: http://pcpartpicker.com/p/Ucj2/benchmarks/
CPU: Intel Core i5-3350P 3.1GHz Quad-Core Processor ($179.99 @ Newegg)
CPU Cooler: Cooler Master Hyper 212 EVO 82.9 CFM Sleeve Bearing CPU Cooler ($29.98 @ Outlet PC)
Motherboard: ASRock Z75 Pro3 ATX LGA1155 Motherboard ($76.99 @ Amazon)
Memory: Corsair Vengeance 8GB (2 x 4GB) DDR3-1600 Memory ($66.47 @ NCIX US)
Storage: Seagate Barracuda 500GB 3.5" 7200RPM Internal Hard Drive ($55.50 @ Amazon)
Video Card: Sapphire Radeon HD 7870 GHz Edition 2GB Video Card ($189.99 @ Newegg)
Case: NZXT Source 210 Elite (White) ATX Mid Tower Case ($49.98 @ Outlet PC)
Case Fan: Antec 75024 79.0 CFM 120mm Fan ($8.99 @ Mac Mall)
Power Supply: SeaSonic 620W 80 PLUS Bronze Certified ATX12V / EPS12V Power Supply ($74.99 @ Newegg)
Total: $732.88
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2013-05-01 03:04 EDT-0400)
I decided on this build for two reasons. One, I get an Ivy Bridge quad core CPU that I can BCLK about 400 mHz without raising voltages, configured in BIOS (or so I was told by Sakkura
HERE) and remaining stable at that.
Second, I utilize the Sapphire HD 7870 gHz Edition graphics which, in my opinion, is an extremely capable card, all the while staying very close to my original budget of coming in under $750.
Some other notes, I chose an affordable Mobo that keeps a few of the goodies of a Z77 Mobo, such as USB 3.0 headers and OC ability, but gives up SRT/SSD caching. A give and take that I'm willing to concede. The case comes supplied with 2 fans and with the addition of a 3rd 120mm Antec fan, since we're not doing anything major with the CPU, I thought we would be able to keep CPU temp under control. More fans can be added to the case, if needed.
I will also add that I'm in the process of procuring my parts so I can't comment on performance at the moment, but I hope to be able to comment soon (so long my first build doesn't result in catastrophic disaster).