Please talk me out of buying the Avalon Eclipse

I would do it if they are in good condition at that price. You’ve probably wanted and dreamed about them for years, and time goes very fast. I took the same chance years ago on a pair of Nestorovic 5AS speakers that I had dreamed about, and even though I only kept them for a few years I never regretted the experience. I don’t think you will either.

Besides, road trips are always fun!

Actually, I am curious more than anything. Nestorovic is also one of the speakers I am curious about! It is just fun to experience all those past products that were the best at their time. I will probably resell them at one point but I want to have that experience. We love road trips but still a stretch for a purchase but still thinking, still thinking :)

$700? Lol. What are you waiting for?

never heard them, but this excerpt addresses your question, quoting Charles Hanson:

"But you know, time has a way of sorting things out. I believe that the Avalon will be one of a handful of products from its time that will stand up in the years to come. Look at the 1950s—as far as we've come, there are still a select few loudspeakers that could make you happy today: the Klipschorns, Altec A7s, KLH 9s, original Quads... Think about it—if I told you that you could only have one system for the rest of your life and it consisted of a Marantz 7, a Marantz 8B, and a pair of Quads, could you be happy? I could. That stuff sounds good, looks good—there's integrity to the design. I'd like to think the Avalon will be remembered like those products."

from Stereophile

If they are in good functioning condition I would buy them.  You will not get any support from Avalon if something goes wrong so consider the $700 a sunk cost.  I had a pair of Avalons.