SR80 got me into this hobby over 10 years ago. Bought them on Craigslist for $50 new/sealed box.

I’ve tried, bought, and sold probably ~20 sets of headphones since (all open back headphones), I’ve gotten to try about 95% of headphones discussed on this sub, including the Grado line, up to the GS1000, which I owned for about a year before deciding to sell. Of all of it, there are 4 models that I plan to keep indefinitely:

Audeze LCD4

Hifiman Arya Stealth (although I have not yet had a chance to demo the Susvara)

Grado Rs2e

Grado SR80 which is held together with electric tape. I will never part with them.