If you like a quicker second Nachtmusik, I'm sure you can't stand the Sinopoli.. It's far from a favourite, but it is interesting (especially in the first movement).
How do you rate Haitink's second M7 with the RCO, the digital recording from 1982? I think it's one of the most succesful Mahler recordings he has made, perhaps the most succesful studio recording by Haitink of a Mahler symphony (although, for sentimental reasons, I kind of like his M5 with the Berlin Phil. as well, but don't tell anyone..)
I have to listen to Stenz again, he's the current chief conductor of the Radio Philharmonic and one of the least interesting conductors I've ever seen. By the way, the De Waart M7 is also with the (Netherlands) Radio Philharmonic, not the Netherlands Philharmonic, that's a different orchestra. Their chief conductor, Marc Albrecht, certainly knows his Mahler. If you want to hear truly great Mahler playing in Amsterdam, go to Albrecht with the Netherlands Phil. instead of Gatti with the RCO.