Bridled or crested, they're all cute as can be. I like how they hang around in pairs.
Some of my favorites are White-fronted Tits, Yellow Tits, Dusky Tits, Southern Black Tits, Mexican Tits, Japanese Tits, and especially Elegant Tits. I've heard Varied Tits can be quite unusual. My girlfriend personally owns a pair of Great Tits. She also has some pretty Orioles.
I never cared so much for the Grey-headed Tits, but that seems to be changing. Though I sometimes can't tell the difference between those and the Penduline Tits.