Hi Dave
It would depend on your budget,but they are all good,The taipan would probably be the cheaper option,due to the 2nd hand availaility,and they can still carry a kite.
The taipan can also be sailed against others in class racing which can be an advantage.The blade and viper are F16 and seem to need the kite to work there magic,Try and get a ride on them and as pete said choose your favorite
Just my 2 cents worth
Richard