Hi UTW..........
Building your own is very rewarding and the great thing about it is there is always someone around on one of the many computer forums who can help you with the odd problem that you might come up with.
Couple of links to sites I used when pondering my first build:
http://www.buildfromscratch.com/frame4.htm
http://www.pcguide.com/proc/gen.htm
Well worth having a go at
Good luck
FBW