I'm not JTM, heh, but I'll tell ya this right off, building a computer is really quite easy these days. (Not to mention cheap...I remember when our first PC cost $2500 new...insanely faster computers are now selling in the $600 range...$800 will get you one nice homebuilt system)
I've made a little hobby (and money =) out of building computers for other people...$50 to $100 isn't bad for 3 hours of work!
Feel free to email me if you've got any other questions...
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Project 1970 - soon to be seen at
http://milhouse.treylis.org:81/