Rhapsody in Blue - Which one?

I think any CD collection has to start with the old warhorse Bernstein/Sony 1959 coupled with equally great "American in Paris". There are countless versions out there many very good, but the bar has been set by Bernstein and everyone else is trying to match it 40+ years later.

Of course it is always good to have other versions in your collection, but if I owned only one it would be Bernstein.
I believe this is also available in SACD format.

Eimir Deadato's version from the 70's was pretty interesting.

Buy them all. I do not really have a favorite and I really have never thought that way as it is tooo black and white. However I have one that I believe is a Telarc that also features "Catfish Row" that is excellent. Really, you should look at each as a different interpretation, each with it's own perspective and each representing a certain truth. That way all of them together represent the total of humanities attempt to understand Gershwin and then each will give you a greater perspective on Gershwin and hopefully a greater respect and understanding of his unique place in the small pantheon of great American composers. What I like to do is play him and then play some Copland as they are contemporaries while one represents a love for the city and the other a greater appreciation for the more not city. You know yen and yang kinda stuff. I'm not explaining this very well but you'll get it if you listen.