used avantgarde speakers are best bang for the buck? i don't think so. don't get me wrong - i heard the original duo's, and was absolutely blown away. but, i heard of several folks that sold theirs, (trios), after hearing the oris 150 & 200 horn kits, which are a lot less cash, even comparing them new to the avantgarde's used. of course, i am also biased - i am presently enamored of my pair of speakers that use oris 150 horns, setting atop heavily modded klipsch lascala bass-bin cabinets. and, i have ~$2k inwested... (purchased used, of course!)
ymmv,
Well, I haven't heard the Oris horn kits, but I have heard the Duo, which a friend owns, and the Trios with the short horns for lengthy sessions at my dealer. Probably the best, or close to the best system I've ever heard. The big MBL gives them a run for the money, but are quite a bit more $$$. As far as the Oris being far less expensive, you're way off the mark. Their current "kits" go for around $15,000 and $40,000 USD respectively. And since they virtually never come up used, you've got a poor candidate, and an even sorrier "bang for the buck".
I'll certainly stick up for the "bang for the buck" on the Magnepans (incredible speakers, less than a lot of 2-way box garbage spanked over on this forum and others), the AG Duos, Trios, and even the Uno, which I've seen come up fairly often at around $5000-6000 used.
ymmv (*_^)