Kubelik.  Neumann.  Walter.  Several by Leinsdorf (#1, #6).  Abravanel
(playing can be uneven, interpretations are usually engaging).  Szell.
Historic Mahler 4 with Mengelberg.  Horenstein (#1 and #3--NOT #6).  Levine
and Haenchen are good in parts.  I am less enthused by Solti, Haitink,
Abbado, and most of Bernstein (his #7 with New York is great!).  (Note that
I am far more interested in performance than sonics.) These should do for
startes.

Aaron J. Rabushka
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http://www.cowtown.net/users/arabushk/