I weigh about 65kg in a wetsuit aand have also had the same need to find kites with a good wind range. So far I've tried a few and as I have a kitesurf shop it has been a mixture of business and pleasure
Currently I have an F-One Mach1 12m for the average winds around here of about 12-25 knots and find it has very good range and is light and easy to use. For lighter days, 8-18 knots, I have an Airush Lift 12.2 (15.2m flat size). The Lift also has excellent range for its size and I can handle up to approximately 20 knots if the wind is steady and the water relatively smooth. For really light days under 10 knots I have a Flysurfer MastAir 12m which I can stay upwind on in 6-8 knots.
I get more range out of my kites by using suitable boards, ie an Underground 141cm Lunch tray for the high winds, Underground 159 Twintip for medium winds and an Underground Smorgasboard 148, (very wide), for the light days. It's easier to come to shore, keep the kite in the air, and swap boards than rerig another kite to expand your wind range.
I think most of the 2002 high aspect kites have good range but it's really good if you can try them. From my experience with Naish AR5 kites which are quite an old design now, I would say any comparably sized 2002 kite is going to have way more range and be easier to fly without tiring than an AR5.
Have fun, Dave (Dr Surf Australia) firstname.lastname@example.org