Just try to find a copy of the original Civ, install it three times on your HD and patch one to FW, and another one with the MGE-patch, both found on this site.
"I would advise against TOT (#3)."
Absolutely NOT! If your local gamesshop sells it for $40, buy it! Install it two times and patch one of them with the no-limits add-on and the MGE-GFX (or something like that) to get a the best Civ2 game ever!
ToT is actually a collection of five games:
-The original civ
-The extended original Civ, where your Spaceship is to the end of -the game but a second start on a whole new planet (you play at two maps at the same time)
-Civ in a fantasy setting, with elves and goblins on four maps at the same time
-Civ Midgard, same as the one above, but is a scenario with loads of scripted events. It adds an adventure element.
-Civ Science-fiction. Almost like Alpha Centauri. Your spaceship lands on a unknown planet and you try to get back to earth.
Just download Civ2 somewhere from the net (I did) and patch it and buy ToT when you get the chance!