Depends where you are, but I just tend to search nationally and consider each car individually. Eg Edinburgh is 500 miles from me but I can be there in a few hours on a plane and 6-7 hours drive home.. Wheras a lot of places closer with worse public transport will be much harder to get to. 80 miles is definitely too short though - but decide what you like and base your considerations on how rare they are. You won't be ploughing through hundreds of cars so just keep the search national and go from there