They are in fact the only cats that I have for the moment!!!
I have been thinking of powering up them a little bit but decided against it. They are designed for the rig they carry, and making the mast much longer will at least here attract the attention of the police once cartopping.
They are fun to sail, but for me the ultimate would be a 14 feet with a little bit more sail.
So for the F12 a stayed rig with 7-9 m2 of sail depending on the conditions you are sailing in.