I found that Gigabyte makes a nice board for 2 Athlon XPs. I could put two AMD Barton 2400+ Mobile in there and oc each to 3200+ speeds Those three things right there would run $343 w/o hsf's.
Then all I would need is some RAM, HDD, Vid, CD, PSU, Depending on what I get, that could run another $250-$350.
Barton Mobile or multi-processor? You can get the Athlon XP 2800+ MP's for about $170 to $190 each each. Tyan and other make dual processor boards for them - I don't think there are any quads available, which would be a great value in the FAH world. You don't need to OC either - this is a marathon, not a sprint.
Anyways.... just go cheap on the other stuff
ram - $80
hdd - you don't have an old small one?
vid - ditto, just get a $5 card
cd - $10, 52x at Fry's
psu/case - $50