Are the other ones full versions, or just expansion packs with a couple of cards?If you are going to get Fluxx, I'd recommend eschewing the vanilla version and going for one of the themed versions. I've got Zombie Fluxx and Monty Python Fluxx, both of which I like better than vanilla. Monty Python's my preferred version, both because I prefer the theme and humor and because I think it makes more creative use of keepers and creepers.