I build my own; have been for 12 years and for other people for about 5, got it to more after I broke my back.
The current system I have you can see it sitting on my computer desk im I the process of building.
The guts of it
Asus M2N32-sli Deluxe Motherboard
XFX GeForce 9600GT 512M - 700Mhz Dual DVI HDTV SLI
4 GB Memory
Drive 1 - 120GB Games / Music
Drive 2 - 150GB - partitioned (System main File Storage)
Drive 3 - 1 TB Movies (DVDs)
Drive 4 1 TB Movies (DVDs)
Drive 5 320GB Programs
Drive 6 - Pioneer BDR-202BK - Blu-Ray Writer Drive SATA
Shark Screw less Alum Case
ViewSonic 22in LCD Monitor
The photo is of my file server down stairs, its CD based