If you had all the "spair parts" needed to build a new (dual cpu of course

!) box and all you needed were the cpu's, mobo & memory and you had $500 to $1000 USD to "play" with, what would you build?
Dual Xeon's?
Dual AMD's?
Any left-over cash to go towards a 265meg+ dual head vid card.
Must be available from eBay, no weird off the wall stuff please!
Regards,
jaybird