There are some fairly decent deals on Cheverolet Impalas out there yet. There were many produced and lots of boomers have them sitting around the country in garages. Big Buicks and Oldsmobiles as well as Pontiacs can be purchased fairly reasonably. If you want to spend more get a convertible. The smaller GM and Mopar cars bring big money as well as the larger Mopars. As several others have stated if they have rust just forget it and move on to a better car. The least expensive car is the one you spend the most money on. Do not buy junk. Parts on any car of the 60's and 70's are out of sight. Simple things like factory style rally wheels, taillights, grilles, and mirrors cost a small fortune. And most important of all is the fact that when you have someone else do the work for you it may not be as good of work as you wanted. These cars cost a lot of money because they need new parts and work even if you barely drive them. Have lots of money handy for deteriorating paint, tires etc. I restored a 1969 hugger orange Camaro SS RS 350 with an automatic. The car was only 10 years old and to make them perfect you really have to spend lots of money. I have owned 5 different Corvettes with the oldest being a 1969 roadster and these cars do cost money to maintain. Good luck with your search and buy a car completely finished and it will eliminate lots of headaches.