Some tips from someone who has bought mostly used gear, while most of my main speakers are DIY.
Buying headroom when you can. I have bought used JBL speakers that were decently high powered and with higher sensitivity. One set is rated at 175 WRMS, with a sensitivity of 89 db. Chances of someone pushing those speakers anywhere near their limit is highly unlikely. Twice, this has proven right with two pairs of the exact model. Most people that would buy these relatively budget speakers would not likely have an amp or AVR much greater than 100W.
Choosing speakers that have rubber surrounds instead of foam. I have speakers from late nineties to early 2000s. They all have rubber surrounds as many (most/all?) do now. The only exception being those with doped cloth surrounds like that found on Eminence woofers. Those types are robust as well.
The JBL woofers have heavy cast baskets and rubber surrounds, among other things. Their 'polyplas' cones are like an extra-durable paper composite of sorts. A lot more robust than I see in other brands budget offerings.
Midrange is stout for it's size, too, and they cared enough to isolate it from the rest of the cabinet. Weird for a budget design to go there. Can see the rubber surround on the woofer just past it. A damp cloth was all that was needed to clean them to like new appearance. Not bad for a 20 something yr old speaker. I ended up building improved cabinets with wood veneer for them just because I had enough leftovers around here to use up. I may have $250 in them but would not part with them, otherwise.
I also look for used parts availability online for a model I am interested in, in the event something is wrong with it. If the speaker is a great performer, I may even buy an extra driver from ebay if one just happens to be a good price, just to futureproof them further.
I'm not that audio complicated. I don't really enjoy "high-end" audio, or at least the marketers classification of it. High power, relatively neutral speakers, with low audible distortion, has not been that hard to achieve buying older, used speakers.