Yeah, and 2nd revised is the one that is most popular,. Of course, if you are just adating the symbolism to Trek, just get whatever is cheapest. All the changes are either in mechanics, setting, or other things that you'll be throwing out anyway.
Probably the easiest solution might be to treat vision quests as mini holodeck adventures. Let the character face challenges and do things, but skew the difficulties to reflect the quest.
I've actually seen two copies of each version currently on eBay! But I have still to check my local games shop which does do second hand copies of various games, and the auctions are still over a week to go just now!