I've mentioned before that I have over five recordings of the Goldberg Variations in iTunes. I just increased that by one after purchasing Simone Dinnerstein's new recording on the strength of Tyler Cowen's comments.
It's definitely a lot more "modern" than Gould's interpretation but it is, quite simply, one of the most amazing recordings I've ever listened to. Definitely a candidate for a desert island album.
Of course, as a composer, the desert island candidacy is as much to do with the piece itself as the interpretation. The Goldberg Variations would have to rate as one of the greatest pieces of music ever written. There is pretty nice article on the piece on Wikipedia.
And for extra Goldberg Variation goodness, check out the video of Christopher Taylor playing parts of it on the only double-manual Steinway ever made.