I'm a complete newbie, 98kg, who bought a 12m 2015 Envy and a 140cm board to start with. Been extremely frustrating the last 2 weeks post lessons to get out due to the run of strong winds we've been having, only got the kite up once and was on the edge of being overpowered...
Had enough yesterday when I drove all the way down to Safety Bay, and the wind was howling again. Credit card took a beating, but I now have an 8M Envy as well. Awesome fun in those conditions, got up on the board for the first time for a descent run. For me it seemed that there would have been too much overlap between the 9 and 12, hence the reason for the 8.