I really don't have a suggestion for a mahler three. I don't have it either!
On another note- I'm not a big fan of barbirolli. I have his 5. Not a real big fan of the interpritation, but mostly the playing is a little sub standard. I'm refering to the Studio Plus label and the New philharmonia orchestra recording of mahler 5. I've never heard of either. I think I'll have another listen though. I havn't put this recording in the machine for a long time. 5 is the toughest to play, and I havn't heard a recording yet that doesn't have some weekness in the interpritation or the performance.
Mahler 7 with Abado and the chicago symphony is pretty amazing. especially the tenor horn solo at the begining. Thats really tough to play.
I've listened to some of the other speakers mentioned.
I liked the thiels, but I wasn't hooked. The JMlabs were great in every way, but to me everything sounded miniature (maybe the gear feeding it?) It felt very strange. It was the opposite effect of what I would want for these composers.
I liked the Vienna Accoustics, but they didn't seem to really capture the passion of the music.
I listened to the thiels and the viennas in the same place. I think there was something wrong in the setup because I heard no clear image from either speaker. The proprietor kept telling me not to listen for an image... yeah whatever.
For all you mahler fans: do you like mahler 1?