Still hesitating between a North/Aero/AB/ARX ? Well.. add the F-One in your list of candidates : this is an amazing wing!
I copy/pasted below a review found on kite-surf.com (Author : "maastren").
Used my new MACH-1 12.1 last saturday in a light wind (12 / 13 knots) using my 1.50 mtr twintip. I'm 73 kg. People were using AB 11.8. The kite has an amazing light feeling during sailing and generates a good constant pulling power even with this light wind conditions. I was amazed I had such a good day unless the light wind conditions. Upwind no problem, the kite likes to set itself in a forward position around 8 o'clock. Turning goes very fast. This year I used a lot my AB 6.3 in heavy wind conditions and this is a fast kite, but the 12.1 F-one turns almost like it. Jumping is easy with this kite, very stable in the air and smooth landings. During depowering the kite, you keep the same sailing feeling, which I never felt before using other kites. I think it's a very good kite and I'm looking forward to test this kite in the upper wind range.