Tomoyo was my favorite, but I liked Kotomi, Nagisa and Fuko a lot too. Actually I pretty much liked everyone other than Kyou when it came down to it.
I can't stand the "I'm going to help you get this guy even though i'm in love with him and will stab you in the back the first chance I get types". Also her butthurt fans tend to be irritating.
Judging from Miyuki's actual tastes (Rather then him just being the opposite of mine) I think Ryou or Kotomi, I could see Tomoyo also, especially when she lets the glasses fetish kick in the last couple of episodes.