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OP is in the US, where getting a RiscPC would be somewhat harder. And for that sort of money you could buy vintage Sun kit and run SparcLinux on considerably more reliable hardware.

Many of the ebay sellers will ship to the US at cost (although waiting for spares to turn up from Europe could be frustrating). All my Acorn machines are still running and are still stable - Acorn kit seems as reliable as Sun kit to me. There is also the advantage of having very nearly the same CPU and OS as the Empeg.

I will concede that there are strong merits to using Sun kit, especially the coolness factor You'd have to go pretty far back in time to find a Sun box with a 70W PSU, though: SPARCclassic, SPARCclassic X, SPARCstation LX or ZX; or some SPARCstation 4s (50W). Edit: also, these Sun boxen can be picked up for $30-$70 in the US so that fits his 3rd criteria (criterion?) much better.