Seriously considering purchasing a speed board but after looking at what is available am a little bit confused as to what size would suit me best.
If you look at *board isonic's for example sizes are all quite close together, so what is the best way of choosing the "right" size.

At 75 kilos and looking to use primarily my 5.8 and 6.6 sails would I go for the W49? Or are there other variables I'm not considering?