Great advice: "Buy anything you can find conducted by R. and S."

This is just to illustrate that the archive of rec.music.classical.recordings can be very useful.
Two outstanding contributors whose opinions I trust (given my own tastes) have given excellent advice, it turns out, at least from my perspective:
Buy anything you can find conducted by R. and S. respectively.
(That's my paraphrase, sligthly simplified.)
Today I ordered M.'s symphonies #39-41 of both (on separate CD sets, I mean) and also a fairly recent B. cycle by S.
I already had S.'s recording of #3, which used to be quite famous on RMCR as well as some other recordings.
As far as R. is concerned, two of his M. recordings (#6 and #9) are very difficult to find, even on eBay.
His M. box is out of print and not available on eBay.
(To avoid tiresome discussions I refer to the composers and conductors concerned just by their last initials.)
--
Roland van Gaalen
The Netherlands