How about this???
CPU
Intel Core i5-2500 Sandy Bridge 3.3GHz (3.7GHz Turbo Boost) 4 x 256KB L2 Cache 6MB L3 Cache LGA 1155 95W Quad-Core Desktop Processor BX80623I52500 - - - - $210
MOBO
GIGABYTE GA-H67MA-UD2H LGA 1155 Intel H67 HDMI SATA 6Gb/s USB 3.0 Micro ATX Intel Motherboard - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - $125
Case w/ PSU
Antec Sonata III 500 Black 0.8mm cold rolled steel ATX Mid Tower Computer Case 500W Power Supply - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - $90
Video card No Need. The video built into the processor will put out a very good HDVI signal for up to 1080p.
Memory
G.SKILL Ripjaws Series 8GB (2 x 4GB) 240-Pin DDR3 SDRAM DDR3 1333 (PC3 10666) Desktop Memory Model F3-10666CL9D-8GBRL - - - - - - - - - - - - - - - - - - -$90
Hard Drive SAMSUNG Spinpoint F3 HD103SJ 1TB 7200 RPM 32MB Cache SATA 3.0Gb/s 3.5" Internal Hard Drive -Bare Drive - - - - - - - - - - - - - - - - - - - - - - - - - - - -$70
CD/DVD LG Black 22X DVD+R 8X DVD+RW 12X DVD-RAM 16X DVD-ROM 48X CD-R 32X CD-RW 48X CD-ROM 2MB Cache SATA DVD±RW SuperMulti Drive - --- - - - - - - - - $18
This is (i think) a complete computer - minus the keyboard, mouse, monitor - peripheral stuff cause I don't know if you needed it, for only - - - - - - - - - - - - - - - - - - $603.
I didn't get the "K" series processor cause then you would need a video card for the board and a board that supports that overclocking instead of on chip video. For an extra $20 you can get the i7 2600 but I'm not sure what your budget might be so I thought I'd go with the almost best. If you want to go with an overclock board for the processor now and get a video card you will have more options in the future for upgrades with the video card and being able to overclocking the processor for increased performance but again, I went with a little more budget conscious choices. Let us know what preferences you might have and we can go from there.
Oh, and this board supports a 16X video card if you want to add that to the current build just let us know and we'll give you suggestions on that as well.