I can second this. Maybe not 30 times, but for my slick UI on a phone I personally prefer sense. (As far as slick UI)
But if you want an iPhone, they're pretty solid. I'd wait for the next one though. I can't see it being too far away.
I love mine; love the interface, the design, texts being arranged like an IM, love it.
Took a long time to save up for it since I refused to go contract (too limited).