for an i7 920 system
i7 920 is $280 at newegg. If you are near a microcenter you might be able to get it for $200.
ASRock x58 Extreme motherboard ($170)
3x2GB DDR3-1333 low voltage (1.5-165) RAM ($150ish)
Samsung F3 500GB HDD ($55)
OCZ Fatality 550W Modular PSU ($65-MIR)
XFX Radeon 5770 GPU ($180)
Monitor may be a problem. I think graphics monitors and gaming monitors want different specs. An OK 22inch 1380x1050 gaming monitor can be as low as $150. I'm not sure if you need better color for graphic design, which generally means slower response times which is bad for gaming.
That should get you started. Start building a wishlist at egghead and post the links here.
I have a DFI Lanparty 790. DFI seems to make a solid overclocking board and their tech support is pretty responsive to emails. I am pretty happy with them.
The main things to look at in motherboards is enough PCIEx16 slots for the number of graphics cards you plan on expanding to. Thats also mainly what dictates the power supply needs.
What 500 Watt power supply? I cant recommend accepting a junk generic power supply. Inconsistent power will make your system flakey with inexplicable strange problems. Bad power can even damage other components in the system.
Go to Raidmax web site and download the case manual (PDF)
Your Raidmax case supports the following motherboards: ATX, Baby ATX, Mini ATX and Micro ATX said:
Your Raidmax case supports the following motherboards: ATX, Baby ATX, Mini ATX and Micro ATX