ASUS A7N8X with an AMD 2700 Barton and 1 Ghz matched RAM.
I'd go with the Deluxe version 2.0 board, the 2500 & a gig of Hyper X 3200 myself. That's what I'm running as I write. You can run the multiplier at 12.5 instead of 11 & get 2800 speeds on stock cooling out of the box. I've put several of them together. A gig of RAM is a lot depending what you use your machine for. What about a vid card to handle the new setup? that's about all you'd need. Well maybe a WD JB 8 mg HDD to feed it?
newegg Prices
A7N8X Deluxe 1 day sale $117
XP 2500 Ret. $91
XP 2700 Ret. $121
Hyper x cas 2.0 1x 512 $120
WD JB 8 md cashe 80 gig, 1 day sale $73.50
That's a good backbone for sure. Not much differance in price for the CPU, but I know the 2500 OC's great! Make sure you've got a good case & PSU!
Dazzle them with Brilliance, or Baffle them with BS!