PCPartPicker part list:
http://pcpartpicker.com/p/19TAf
Price breakdown by merchant: http://pcpartpicker.com/p/19TAf/by_merchant/
Benchmarks: http://pcpartpicker.com/p/19TAf/benchmarks/
CPU: Intel Core i5-4670K 3.4GHz Quad-Core Processor ($239.99 @ Newegg)
CPU Cooler: Cooler Master Hyper 212 EVO 82.9 CFM Sleeve Bearing CPU Cooler ($29.98 @ Outlet PC)
Motherboard: MSI Z87-G45 Gaming ATX LGA1150 Motherboard ($159.99 @ Newegg)
Memory: G.Skill Ares Series 8GB (2 x 4GB) DDR3-1866 Memory ($63.00 @ Newegg)
Storage: Samsung 840 Series 120GB 2.5" Solid State Disk ($93.99 @ Adorama)
Storage: Western Digital Caviar Blue 1TB 3.5" 7200RPM Internal Hard Drive ($66.59 @ Outlet PC)
Video Card: Sapphire Radeon HD 7970 3GB Video Card ($315.38 @ Newegg)
Case: Corsair 300R ATX Mid Tower Case ($49.99 @ Newegg)
Power Supply: Corsair CX 750W 80 PLUS Bronze Certified ATX12V Power Supply ($69.99 @ Newegg)
Optical Drive: Lite-On iHAS124-04 DVD/CD Writer ($17.98 @ Outlet PC)
Operating System: Microsoft Windows 7 Home Premium SP1 (OEM) (64-bit) ($89.98 @ Outlet PC)
Total: $1116.86
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2013-06-24 19:33 EDT-0400)
I think this is the best budget PC for around $1100? The GPU also comes with borderland 2+ 4 other free games! That's worth over 200$, if you were to buy them on steam
Now there's a lot of room for upgrades if you need to, but this is the best budget build and you won't get any lacks in performance overall.
Here's a few upgrades you may consider if you want to spend more.
1. Upgrading the 7970 to a Gigabyte 770. You'll experience 10-20% increase in performance. However, you're losing around $200 worth of games and you'll have to write another 100$ out of the checkbook.
2. Upgrading the PSU to a Silencer Mark 3 750W or a Corsair TX 750W v2. The CX is great for budget builds, but you get a bit more quality with those other PSU.
Besides that, i think you'll have a great PC at a even better price
http://www.newegg.com/Product/ComboDealDetails.aspx?ItemList=Combo.1349187&nm_mc=AFC-C8Junction&cm_mmc=AFC-C8Junction-_-na-_-na-_-na&cm_sp=&AID=10440897&PID=3891137&SID=rewrite
That's the combo with borderlands 2+ all AMD games. As you can see it's 327 dollars, with 20 rebate. making it a great deal at 307$