Hi G,
We find the 8m Ozone Access XC is more than enough in light winds. We have good sessions in 8 knots and anything above 15 knots is getting crazy.
Dont use inflateables on hard packed ground, you'll trash the hell out of them, especially while you are learning.
The foils are great for landboarding, you just don't need the kind of speed and responsiveness you get from water kites when on land.
Good winds,