I think if it's european and carbon from 2005-Now, it'll have future interest. Not to be biased on my La Pierre Xelius, but 9s Ultegra Look, Time & BMCs seem to go for higher prices at bike-swaps than 9s Dura-Ace Specialized and Giants.

As for mountain bikes, that's a tough one to determine. No 90's MTB seems to have any value besides being a hybrid these days unless titanium.