Its costing me about $1330 NZD. That translates to about $1100 USD, but I think you could do it for $900USD since you get better prices in the US.
I'm yet to buy the CPU or RAM as I wait for funds. I have everything else.
IcyGamma's Gaming Mini-ITX
3.40GHz CPU (4 core Intel i5-3570)
1GB Dedicated Graphics (AMD Radeon HD 7770)
16GB Ram (lol)
1TB Hard Drive
Asus P8Z77-I DELUXE Mini-ITX Motherboard running with 430W PSU (yes, this power supply IS fine wattage, mini-itx handles power better)
INTEL CORE I5 3570 IVY BRIDGE 3.40GHZ 6MB 77W LGA1155 ($285.00 NZD)
Corsair Value 8GBx2 DDR3 1333 PC3-10600 CL9 ($131.76 NZD)
Asus P8Z77-I DELUXE Motherboard ($289.00 NZD)
Seasonic S12II, 430W ATX PSU, Active PFC, SLI Ready, Black ($124.50 NZD)
Prodigy Mini ITX Computer Case - Black ($135.00 NZD)
WD Caviar Black 1TB 7200RPM 64MB Cache SATA 6/GBs ($150.00 NZD)
Asus Radeon HD 7770 1GB ($209.00 NZD)
Can't waittt.