The above suggestions are all excellent. I have seen several club members fly the U-Can-Do which seems to perform well at very slow speeds; hopefully it is still available. Another pattern airplane worth considering is the Deception. It has a thick -as in slower- airfoil and can be built with fixed gear if you wish. Keep it light and it will perform well.
Are you looking for an airplane with a maximum airspeed of the Kadet Senior or just a slow landing speed?