I found a copy at the local thrift shop. Only problem is I managed to get the one version that isn't compatible with the updates and patches, but it seems to work well -- I was impressed that it worked out-of-the-box in Vista. It does seem to run fast, but I'm not sure about the original speed, so no way to really calibrate it.
Someone there at Youtube pointed me towards Precursors, a Russian game that appears to be a more recent take on the genre:
It definitely looks interesting. Anyone tried it?