My system is somewhat dated now - it's 4.5 years old, but it still kicks butt!
Intel S5000XVN server/workstation motherboard
2x 3GHz E5450 Penryn CPUs
320GB hot-swap Sata-2 system drive
4x500GB Sata-2 data drives (internal)
2x CD/DVD recorders
3 external eSata-2 RAID arrays - 2 in RAID-5 format, and 1 in JBOD format - total storage of ~16TB.
Video - nVidia 8800GT w/ 2 1920x1200 displays.
1x 1TB NAS RAID-5 array