Steve,
It didn't make your short list, but maybe you just didn't consider it.
My All Time favorite is the manual transmission (5 or 6 speed) 2 seat Mazda Miata. It meets all of your requirements and is the most fun you can have with your cloths on.
Additionally, less than 2,500 pounds so no brake is really needed, 2007 and later comes in a Retractable Hardtop, Put in neutral and go.
We have dragged a 2000 and a 2010 through all lower 48 states.
I have all of the information needed to set up and tow.
Let me know if you want more info.
Tim