I voted for a KSB. I have one and he's wonderful. He's definately not mean, but tends to thrash around a lot when I'm picking him up. He usually settles down after that, though. I got him from someone who has many KSBs, and had to get rid of this particular one because he wouldn't settle down (I don't see what the problem was, though, because he's pretty calm once he's out). That implies that all his other KSBs were calm, which I've heard is the norm. I have no experience with Rosys, though. I opted for a KSB over Rosy because of space requirements.

GOod luck!