Jags,
Some info from someone heavier than you (100 + gst):
I have a 12m kite which was my beginner kite. If the winds are just in the green, then i can get along, but i do have to sine the kite to keep the speed up. If the winds drop below 17 kn I find it almost impossible to keep edging.
i can stand without being lifted off my feet with that 12m up till about 30kn, after which i just get dragged, and have to depower the kite - and then bring it in.
I reckon u'd be right with a 12 from about 16 - 26kn, of course that depends on how big ur board is, but u prolly will get a bigger board also - less u want to get real mad real quick cause you cant start planing.
In almost all conditions i rig all lines up to the middle knots, xcept for when its real windy and i rig the front to the middle knots and the back to the knots furtherest from the kite so i have a bit more depower ability.
This is just what works for me. i'm sure other will have their say

if ur learning stick with the 12 - its always cool to have a smaller kite for when it blows, and those lighter boys just sit on the beach and watch.

have fun choosing - it's always hard with such a big range.
robbo.