We have some favorites in common: Bernstein/Sony, Bouleiz/Cleveland, Solti/Chicago (I need to listen to Gielen and Sinopoli again). But my desert island choice is missing from your list (and I know why. I know you hate him

): Klemperer. And, yes, I admit he isn't easy to love but I
do love his broad, even perverse approach to the first and last movements. Where he wins decisively, I think, is the Nachtmusik I. His slow tempo, his pointillistic sound painting, projects the music far into the 20th century. Klemp makes it easy to understand why the Second Viennese dudes loved this symphony.
I hope your future listening includes Barenboim. I heard him live, in Berlin, during the 2007 Mahler fest, and his 2005 recording is as fine.
Sarge