I voted for the 2400c because it's small, upgradeable, and reasonably capable. You are missing a few machines, though, but I'll forgive you.

If I had my pick of the litter, it would be a Pismo G3 because it can run OS 9, OS X, and Linux. It can take a *beating*. It's upgradeable. (G4 and a gig of RAM? Yes please!) And it's equipped with all the modern connections.

A close second would be the Wallstreet G3.

Peace,
Drew
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Power to the PowerPC!