The Tapian 4.9 is a good boat and a cheap option, although at your weight, it will not carry the weight as well as other options.
The Blade has more volume and will carry you weight better than the Taipan.
A Viper has more volume then the Blade but is offset by the extra weight of the platform.
Flip a coin between the Blade and Viper (or test sail both) but it will come at a price as there are few second hand boats on the market and they will demand top dollar still.
If your budget is low, then you will still enjoy the Taipan.
