I'm looking at about $800 for:
Soyo Dragon Ultra
AMD 2100 + TaiSol fan (probably)
512M Corsair DDR2700 CAS2/heatsink
80G WD800JB
Gainward GeForce 4200
Lite-on 16x DVD drive and 52/24/52 CD/RW/R drive
SoundBlaster Audigy
floopy, case, etc.
The mobo/cpu/fan/memory is a combo ($379) from [link|http://www.monarchcomputing.com|http://www.monarchcomputing.com] - they give you a 3-year warranty on the combo for an extra $25, and it's tested for compatibility.
How much did you pay for the CPU? 2800s are pretty expensive still...