I've always liked the look of the '71-'73 Cougar. '71's could be had with a 429 Cobra Jet....
1968 Cougar GTE could be had with a 390hp 427. The only Fomoco ponycar meant for the public with a factory installed 427, Mustangs didn't even get them. They're pretty rare, but I think those are the neatest Cougar.