I was looking at the EMI Mahler box at the EMI site. Wow! There are a ton of songs and song cycles with the greatest names in Mahlerdom: Christa Ludwig; Janet Baker; D. Fischer-Dieskau; Karneus (forget her first name, but she's good). It's going to have the Fisch-Diesk "Songs Of A Wayfahrer" with Furtwaengler; the "Ruckert Songs" with Baker/Barbirolli; the "KTL" with Ferrier/Walter; the famous Szell/LSO "DKW". Then there's the classic Klemperer "DLvdE" with Ludwig and Wunderlich. What's not to like? I also think that the selections for the symphonies are really sensible.
I have Klemperer's "live" Bavarian R.S.O. M2 (w/ Janet Baker), but not the studio one. The studio version is being included in the box. Rattle's M3 is much better than most people think, aside for the relatively fast ending (which doesn't bother me so much). It's rather ingenious to include the Horenstein/LPO M4 (far better than the Welser-Most, in my opinion). The Tennstedt M5 will be the "live" 1988 one. I like Barbirolli's studio M6 more than his famous M5. And, Tennstedt's studio M8 is far better than many people think (the Rattle 8th would be a good one also). I would have preferred that EMI used Rattle's Berlin remake for M9, but Barbirolli's fits on a single disc. Besides, they are including Rattle's perfectly fine Berlin M10 (and I assume that it will have been remastered, which it could use).
Seriously, I think this was much better thought out than the Universal one that flies under the DG flag. Cheaper too.