What is the best sounding Mahler symphony cycle?

I can, unabashedly, say that I have heard most of these and find something appealing in almost all of them. However, the OP was asking for "audiophile quality" and, for me, that means a well-balanced and high resolution recording. This eliminates all the Bernsteins, unfortunately.

However, the Abbados on BluRay are superb in every way as are the MTTs and many others on SACD (Chailly, Boulez, Jansons, etc.) Zinman doesn't move me and the sound is only OK, imho.

If you are looking for high quality audiophile approved recordings, MMT's performances are easily some of the best CD's available. As with everything else, however, his performances may or may not be your cup of tea, but I too can recommend his 5th. Zanders performances of Mahler on Telarc are also excellent recordings and include a CD in which Zander discusses the symphony.

Performance wise, if you like your Mahler a little more expressive, consider either Bernstein cycle. You can't go wrong, except with the Vienna Phil set on DG you may want to substitute out the 9th for his recording of it live with the Berlin SO recorded live in 1979, an outstanding performance I think!

Thanks to each of you! The Bernstein box sounds like a good place to start. Abbado for an independent 1st and 5th seem to be reasonable to purchase as well. Again.. thanks.

To me the Solti/Chicago set is better than Bernstein.
To my ears the best sounding set, at least on redbook. is the Phillips Haitink/Concertgebouw. He also has the great Maureen Forrester and Ely Ameling not to mention the Amsterdam Chorus.
Haitink is less "sturm and drang" than most which I like better myself. YMMV

Off subject I know, but I am just listening to a wonderful live BBC Promenade concert of Mahlers 2nd by the Bavarian Radio Symphony, conductor Mariss Jansons. I don't know if you colonials can get quality internet feeds or Radio transmissions of the Proms. If you can, this Summer series of 7 day a week daily concerts on BBC Radio 3, is not called the worlds best concert series for nothing.

The Complete Ring cycle in Concert performance by Barenboihm 2 weeks ago, was just magical. CD and LP get a break when these concerts are on every year from July to September.