Don’t ignore s/h Kia, Mitch which has a 7 year manufacturer’s warranty.
Just make sure that any cars that have a long remaining warranty have followed their service schedule EXACTLY.
Although many standard warranties from manufacturers which are around 3 years let you have services done anywhere that uses genuine parts, I think some of the longer warranties such as KIA and Toyota require services done at main dealerships. Not 100% sure, but check before buying on the basis of a very long warranty.