I'm 63kg and the Havoc 8 and 12 has been the most perfect quiver I could ask for. So that would probably be a 10 and 14 for you. I ride the 8 in anything from 16-32 comfortably and the 12 in light conditions with a twin tip or a surf board. They were the only two kites that I brought on 4 winter trips and did great. However, I just got a 6m too for the nuking Gorge winds in the summer.
IÂ´m considering the same but am a little afaid that the 6 and 8 are too close to each other in windrange. What do you say? How much upper wind range do you gain with the 6 compared to the 8?