Heres mine costed me bout $600-$700
Intel i5 2500K 3.3 ghz.
EVGA Geforce 460GTX 1.0GB GDDR5
8GB PC1333 Corsair
500GB 7200 RPM 16MB Cache x 2
MSI MS-7673 Motherboard LGA 1155 CPU
650W Antec Green PSU
Cheap case that hold ATX motherboard with fan outlets
Antec Kuhler h20 CPU water cooler
I would recommend getting an SSD and a normal hardrive