Fooly Cooly is a trip. Be aware, when it was made, it was made as a tech demo to show off cool new animation technology. Don't expect it to make sense. Expect it to be pretty and amazing in terms of art. And imo it is.
The tech demo people who made it were students IIRC and so it's story-elements (if you can call them that) are pretty raw in terms of "lets just make cool shit and go with it".
My Top 3? According to anime-planet, I have a lot of 10/10.
Hmm, that's so hard to define. I don't think I can do a "just Top 3".
Some of my favorites are gonna be:
* Read or Die (OVA then TV)
* Dragon Dentist
* Now and Then; Here and There
* Hunter X Hunter
* Arakawa Under the Bridge
* Golden Boy