Almost any of the original AMT annual kits from 1965 to '69, especially the '66s and '67s, in their original boxes. I've managed to acquire several of them in the last few years. My favorites are prolly '66 Skylark, '66 Barracuda, '66 Mustang HT/Convertible, and '66 Corvette roadster.
AMT '65 Chevelle, either original annual or the AWB funnycar.
JoHan '68 Javelin with the Logghe-chassis funnycar option. Also, any other '68-'70 Javelin, or the AMT AMX with the funnycar option.
MPC '33 Chevy Sedan Delivery.
MPC '66 and '67 Bonneville hardtops.
I'm sure I'll think of others but the above is a good "core" list.