What is the best sounding Mahler symphony cycle?

Also, the Gergiev/LSO cycle may not be the absolute best, but it is one of the most consistently good Mahler cycles right now. 

@rvpiano, I will list the symphonies in order with my preferred conductor.  NSP = no strong preference.  3 (Haitink), ,1(Abaddo), 6(Bernstein), 4(Solti), 2 (NSP), 5(Jansons), 8(Wit), 9(NSP), Das Lied(Zinman), 7(Zinman), 10(Zinman).

Here's a real sleeper recommendation for no. 4.

On the shelf I have Bernstein, Fischer, Maazel, Mengelberg, Salonen, and Szell, but I always return to Franz Welser-Most.  In particular, Felicity Lott floats the soprano part in the fourth movement more beautifully/ethereally than any other recording I've heard.

Which are the better recordings from the Royal Concertgebouw Orchestra: the Bernard Haitink cycle, the recordings with Mariss Jansons, or the new recordings with Daniele Gatti?

Anyone interested in reviving this thread?

I have Bernstein’s early 60s cycle recorded with the NY Philharmonic, and remastered by Sony (2009). I also have Bertini/Cologne/EMI and Inbal/Frankfurt/Denon, as well as individual discs (primarily Boulez/DG with 4 different orchestras). The Boulez discs sound really good but I’m looking for a SET with audiophile sound.

I’m aware of the Tilson-Thomas/SFSO set on SFS Media, and the LSO/Gergiev set. Are there any others on SACD? Does anyone have both Tilson-Thomas and Gergiev, and how do they compare? How about Chailly/Concertgebouw? How about Vanska/BIS (which have issued all the symphonies except 3, 8, and 9) ?