I really like '31, '32, and '40 Fords. '34, '55, and '57 Chevys are very nice, too. Other favs include the '49 Mercury, '55 and '57 T-bird, C1, C2, and C3 Corvettes (especially the '63 split window C2), '64-'72 Chevelles, '67 and '69 Camaros, '68-'74 Chargers, '70-'73 'Cudas, and most any Mustang from '64 1/2 to '73. Can't leave out the Pontiac GTO or early '60's Impalas.
Too many to list, really, but there's an idea of most of them.