Ride the R80
All my old bikes were R75s and R80s, mostly run 12 months a year, rain or shine. I didn't have a bike for 19 years, and I just got an old R100S, for which I always had a hard-on back in the day.
I enjoy my bike, it's in decent running condition. While there are differences in the performance, they exist in a part of the riding experience that I virtually don't use. Don't get me wrong, I enjoy a quick ride sometimes. And I do dig the twin front disc brakes. But honestly, for 99% of my riding there is no meaningful difference from the engine size.