I just saw Kiki's Delivery Service earlier this week. I enjoyed it a lot more than Castle in the Sky. I haven't seen Howl's Moving Castle yet, but I'd like to. I've seen Princess Mononoke and Spirited Away, it's hard to say which one I liked better. My Neighbor Totoro looks...weird.
I love watching the subtle things in Miyazaki movies. For example, in Kiki's, she trips and slams the shopping bags down on the table. As she walks away, a grocery item starts to slide down the bag. It slowly topples and falls out of the bag, onto the floor. He pays a lot of attention to detail.