I already have 1 in mind with my 1200 dollar budget but then I asked somebody and they made me make unsure about it (even though they didn´t help with it :P)
Here are the parts
ASUS DRW-24B1ST/BLK/B/AS Black SATA 24X DVD Burner - Bulk - OEM
COOLER MASTER HAF 912 RC-912-KKN1 Black SECC/ ABS Plastic ATX Mid Tower Computer Case
Seagate Barracuda ST500DM002 500GB 7200 RPM SATA 6.0Gb/s 3.5" Internal Hard Drive -Bare Drive
Zalman MZ230ED Black 23" 5ms Widescreen LED Backlight LED Monitor
MSI N560GTX-Ti 448 Twin Frozr III PE/OC GeForce GTX 560 Ti - 448 Cores (Fermi) 1280MB 320-bit GDDR5 PCI Express 2.0 x16 HDCP ...
CORSAIR HX Series HX750 750W ATX12V 2.3 / EPS12V 2.91 SLI Ready CrossFire Ready 80 PLUS GOLD Certified Modular Active PFC ...
Microsoft SIDEWINDER X4 Keyboard
Logitech G400 Black 8 Buttons 1 x Wheel USB Wired Optical Gaming Mouse
CORSAIR Vengeance 8GB (2 x 4GB) 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800) Desktop Memory Model CMZ8GX3M2A1600C9B
ASUS P8Z77-V LK LGA 1155 Intel Z77 HDMI SATA 6Gb/s USB 3.0 ATX Intel Motherboard with UEFI BIOS
Intel Core i5-2500K Sandy Bridge 3.3GHz (3.7GHz Turbo Boost) LGA 1155 95W Quad-Core Desktop Processor Intel HD Graphics 3000 ...
Microsoft Windows 7 Home Premium SP1 64-bit - OEM
COOLER MASTER Hyper 212 Plus RR-B10-212P-G1 "Heatpipe Direct Contact" Long Life Sleeve 120mm CPU Cooler Compatible with Intel ...
My initial concern is that the RAM or the Video card might not be compatible with the Motherboard. I´d like the budget to go to 2000 even though I unfortunately surpassed it by 30 dollars. I assume there are cheaper motherboards out there but I have little knowledge about which are good and which are mediocre.