I have very limited inside wintering space for my succulents. I am wondering which tiny cacti do you like the best- especially any of the clumpers? I have a "Fairy Castle" Acanthocereus tetragonus(?), and a tiny opuntia. I am liking the upright habits better than the sprawling ones. I am looking for easy-care ones that would be at home in 4 inch pots.

I also really love the rosette-shaped ones like Aeonium- Black Rose, even though those require considerably larger pots. Any favorites among that style?