Go for the RT/10 - especially in Fla. You get the best of all combinations; hard top, soft top or no top. Unfortunatly, we just got 7+ inches of snow here in CT so it looks like the Snake is in hibernation till Spring. Don't rule out red - it's classic, really shines after a Zaino treatment and draws loads of attention.
You will find Viper is in a class all by itself. I had a deposit on a Corvette but cancelled the deal when I decided I too wanted a real performance car. The Viper is an absolute rocket!!
Good luck in your hunt.