Came up with this pretty quick, but everything should work together. Someone might want to double check for me though.

Casing : Antec Three Hundred Two Black Steel ATX Mid Tower Computer Case

Extremely good budget case, should be able to hold just about anything whenever you want to upgrade later. It's an improved version of the Antec Three Hundred case, which is probably considered the apex of budget cases. Not as fancy as Fenken's case but I like cases that look simple.

Motherboard : ASRock 970 EXTREME3 AM3+ AMD 970 SATA 6Gb/s USB 3.0 ATX AMD Motherboard

Fairly standard motherboard. Nothing special, should work just fine.

Processor : AMD FX-8150 Zambezi 3.6GHz Socket AM3+ 125W Eight-Core Desktop Processor

Very good processor, outperforms most intel processors in your price range. Eight-cores is a nice plus although it will probably be years until programs take full use of all eight processors. Also, this is personal preference, as I prefer amd over intel, but for a cheaper price it performs better than the 2500k.

Graphic Card : HIS IceQ H787Q2G2M Radeon HD 7870 GHz Edition 2GB 256-bit GDDR5 PCI Express 3.0 x16

Absolute beast of a graphics card. Should be able to run any games with no problem at all.

RAM : G.SKILL Ripjaws X Series 8GB (2 x 4GB) 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800) Desktop Memory

Decent, cheap RAM. Nothing special.

Hard Drive : Western Digital Caviar Blue WD5000AAKX 500GB 7200 RPM SATA 6.0Gb/s 3.5" Internal Hard Drive

Nothing special. Should hold everything you need.

SSD : OCZ Agility 3 AGT3-25SAT3-120G 2.5" 120GB SATA III MLC Internal Solid State Drive (SSD)

Enough space to hold your operating system, several games and more. If you don't know, SSDs are basically really really fast hard drives but are usually very expensive. This one is pretty cheap on sale though, although OCZ probably isn't the most reliable choice for SSDs.

PSU : COOLER MASTER GX Series RS750-ACAAD3-US 750W ATX12V v2.31 SLI Ready 80 PLUS Certified Active PFC Power Supply

Chances are you won't even need 750W for a long time, even if you decide to crossfire. It was a pretty decent power supply for a good price though.

Total : $1001.92 with a possible $75 in mail-in rebates.
$926.92 + however much shipping is.