There are several to choose from in those years.
There is the Chevrolet Blazer or GMC Jimmy. It is a good choice due to the fact that general motors parts interchange so easily. For example all most all parts will fit from a chev of gmc pickup. Also motors and transmissions will fit from most GM cars.
Jeep has made several good suvs from the 40s to present. They have a vast following and should be easy to find parts and advice for.
The International Scout was a good quality machine. There are draw backs to the scout though. First it is somewhat rare and quite hard to find parts for. Second, vintage International vehicles have a low resale value so if you plan to restore it you will spend much more money than it will be worth. The good side of having a low resale value is that you should be able to pick one up in good condition for much less money than any other suvs from this era.
My personal favourite is the Ford Bronco. They are good quality and quite easy to find parts for. They have a large following as well and you should be able to find lots of information and advice for them. I would avoid the Bronco II from the 80s. It was not very good quality and lacked the horse power required to make a good 4×4.
Many people will disagree with me, but I would recommend staying away from any of the imports in these years Most for them had very low quality and all of them are very expensive to repair. Most imports also lack the horse power to make a good 4×4.
Before buying any classic vehicle be sure to research it well. Most will have websites and books devoted to them. Also check the value to avoid over paying. A good place for this is nada guides dot com.
Hope this helped
k5 blazer over anything. but thats more on the 70’s