Lviv - smaller and slower paced. I happen to like smaller cities, so it's high on my list. Very affordable
Kiev - larger city, maybe larger than I would like, maybe not
Budapest - big city, lots of hustlers and scams, but still very pretty and a lot to do
Tallinn - I hear Estonia has the most beautiful women in Eastern Europe, but I don't know much about Tallinn except the really high STD rate
Prague - I've been there once. Beautiful city, but it's also party central these days. I may want someplace slower paced, plus I have been there once.
Any suggestions? Words of wisdom? Advice for travelling to Eastern Europe?