All the cool kids are doing it, so why not? Here are my favorite recordings of each Mahler symphony.
Das Lied von der Erde: Otto Klemperer, New Philharmonia Orchestra
*denotes an SACD
Where's 10? I'm afraid I'm too unfamiliar with it to render a good judgement. Gergiev? Seriously? Yes, seriously. Why so many SACDs? Because they're what I happen to listen to most. Walter's 9th? Absolutely.
List is subject to change at a moment's notice. I think what I realized most from doing such a list, is how many more recordings I need to hear that I haven't!