I think Cardigans suit me PERFECTLY... it's kind of ridiculous. I have the temperament of one, and the energy level, and the sense of humor.
They fit me extremely well. I want one as my next dog, if not a Smooth Collie.
It's strange because Border Collies do not fit me. They are much higher energy than me. I am a calm, laid back type, not type A like Border Collies! D; But I fit them surprisingly well. Gonzo has taught me so much about myself and dogs. I have a way with them, as far as keeping them focused and calm. When my friend works with her BC in a frantic and impatient manner, she is spazzy/all over the place/jumping up on her and losing focus. When I work with her, she picks up on my energy and calms down completely. I find that I have to adjust in working with Fozzie and other laid back dogs, because I'm soooo used to having to be super calm and keeping the intensity to a manageable level.
Juno, if you can handle Boxers, I would think you'd easily handle Border Collies. Both are energetic working dogs, but in different ways. Border Collies are controlled and focused with their energy, while Boxers are bouncy and super exhuberant about it. I often find my patience/skills tested working with Boxers, and they are up there with BCs in intelligence!