Pretty much any beginner kite made by any company would probably work. The first kite I ever flew was a 10m ozone frenzy in light winds. Basically I learned how to steer the kite and feel the drag a little bit. After a while I went kiting in increased winds and stuck with the frenzy for a while. I have flown a North buster and have seen many beginners get up and rind with them no problem. I have also ridden the ozone access which was similar to the frenzy without the boosting power.
If you are set on getting foil kites I would have to recommend access or frenzy (they can ease into it) as these are pretty much the only foils I have flown. Although if you can find a better deal on a different brand of foils I would probably take it as they pretty much all fly the same as far as I can tell from other riders experiences.
Are they going to ever try water? If so you might want to look into lei kites. The foil kites don't work so well in water if you drop them
I am sure you will get a few PM's from the kite sellers on here. They get have some pretty good deals usually.