4 gigabytes of RAM is "high end"? I built mine for <$700 (including a copy of windows 7) like three years ago and put 8 in mine. Anyway, since everyone else is, I might as well post my exact specs:
NVIDIA GeForce GT 430 (1 gigabyte vRAM)
AMD Athlon(tm) II X4 645 Processor (4 CPUs), ~3.1GHz
4x2 gigabytes Corsair RAM (do not remember exact model)
Some old, generic 500 gigabyte hard drive and DVD drive
As for input peripherals and such:
Turtle Beach DPX-21 Headset
Logitech G110 Keyboard
Logitech MX518 Mouse
23" Samsung HDTV for my monitor
No clue what model my motherboard is. Too lazy to check my order history on tigerdirect. Goes without saying I'm using 64-bit Windows 7.