I received word that there will be a box set made up of the entire Vaenska/Minnesota Mahler cycle. Therefore, I'm going to hold off purchases of the discs until that happens. The next release will be M8, followed by M3. I don't think there are plans for a "Das Lied von der Erde". That piece really should be included in cycles of the complete symphonies (and placed between the 8th and 9th symphonies).
As of now, I have Vanska's M2, M6, M7 and M10. I lost my copy of M4 (it's a long story). I'm tempted to add the new M9, but I will wait for the entire box. As with ALL Mahler symphony cycles, not every item isn't equally good. But I really do like the finale movements in both Vanska's M1 and M5.
If and when I buy the complete Vanska cycle, I might put my Boulez Mahler box up for sale. I really don't play those that often. I have an sacd/cd hybrid disc of Boulez's M3 (Vienna). I would just need to find used copies of his M8, and of the "Das Knaben Wunderhorn"/M10 Adagio disc (Cleveland). Those are easy enough to find at a reasonable price. I have two copies of his Vienna M6 (which is still my personal favorite of any). I love the first and third movements of Boulez's Cleveland M7, but the two Nachtmusik are taken quite swiftly, while the finale needs a bit more pep in the back half of it (where everything begins to go nuts). It is superbly played.
Your comments and criticisms (don't be TOO critical!) are welcomed.
Barry