The Knack, or British Slim Twist, is a good possibility. The Lady Gillette is another. Both are very similar in nature to a Super Speed and feature longer handles. The Super Adjustable is also another option. Another very good quality vintage razor that would be comparable is the Schick Krona.
I'll second the suggestion of a Gillette Knack. I have one from 1968, and it feels good in the hand. It delivers a good shave too. The handle is a covered with a blue plastic sleeve that is functional, but not much to look at.