My suggestion would be the Kurzweil MicroPiano module. It has much the same sound set as the Kurzweil Mark V series console pianos. I have a Mark V and have never found a piano sound that inspires me more. If you can't find one of those (check ebay) then I would suggest the ME-1 rack mount version of the current Kurzweil SB boards. Lastly, any good module would be better than a noisy PC - I like Roland, but Yamaha, Korg and Emu have great mods too. UD's offer is probably worth a try too - Roland pianos are usually very high quality.

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Cass Pawlowski - Motown
PSR2000, SC88, Cakewalk