Which used Honda S2000 sports should I buy?
Opt for the GT over the standard model and you should get a hard top, in addition to the standard electric hood. That apart, there's no other choice of models, nor of transmission - all come with an excellent six-speed manual gearbox. The standard specification for the car is excellent and you get a starter button and racing-style drilled pedals.
In other words, all you have to worry about is finding one in the right colour and in the right condition.