First of all, if you can afford a new boat, make the choice between a Falcon or a Viper. I wouldn't consider the Blade as an option as the Falcon is an evolution to the Blade at the same price.
If you can't afford a new boat, I think the Blade is the only option in US (next to the Viper alter cup boats maybe)(and don't understand me wrong, the Blade is a great boat to sail).

I've been sailing the Blade on the North Sea for 3 years now and I must say it is a great boat one and two up. If I would have to choose a new boat now, I would definitely go for the Falcon as it is a really optimised F16 and I'm very happy with the support from Matt.
I know nothing about support for the Viper, but I do know it is not an optimised F16 as it is too heavy. Also the fact that is has a different rating then other F16 doesn't make to too keen on the Viper as I think it makes it really confusing and not good for the class as a whole.

Next to the weight/rating, to my opinion the hulls are also a little overdone. For the lighter weight crews or one-up sailors I can imagine it's not easy to get the bow down upwind. Resulting is a lower heading.

PS the voting does not work.

Regards,
Gill