Many listers here rightly recommend the Richter and the Michelangeli. If you are only going to have one version, I think the safest bet is the Zimmerman. Michelangeli sometimes is a little free with the printed score, albeit beautifully so. They do tend to float rather freely at times. Richter is live and has all the pluses and minuses of a live recording. I also have enjoyed the Gieseking Preludes from the complete set of Debussy piano music (EMI). For many this could be a first recommendation, but it is mono and that may be a turn-off. But for people who like that sort of thing, it is just the sort of thing those people will like. Ray Osnato