it depends on how much you wanna spend. f money's not an issue, i'd say get a lisa I. they're reallly nice machines. occasionally you can find one on ebay, but in nice condition they usually go for about 6 or $7,000.
I don't even want to think what an apple 1 would cost. there were only a few hundred or a few thousand ever made. I know one just sold for some obscene amount of money. even a 128k is pretty expensive, but a very nice collector piece. Personally, I'd love to have a Lisa, the first commercially sold machine with a GUI (that I know of anyway).
Well, I was thinking I would probaly enjoy playing around with it. I have never really used anything but OSX, so I thought it might be fun to get like an old Classic or Color Classic, and get some old software and fool around. It would be like an old car or typewriter or something like that...It works and you can use it, but not for everyday, just for fun.