Sorry to necromance but I was thinking about Ghibli as I watched Ronja the Robber's Daughter (which I absolutely adored and it's one of my all-time favourite Ghibli works)
My favourites (TBH I did try ranking these but I like all of them about equally):
Kiki's Delivery Service
Only Yesterday
Porco Rosso
My Neighbour Totoro
Whisper of the Heart
Lupin III: The Castle of Cagliostro
Princess Mononoke
Spirited Away
The Great Adventure of Horus, Prince of the Sun
The rest of the ones I like ranked in order from really good to good
Castle in the Sky
Nausicaa of the Valley of the Wind
Howl's Moving Castle
Animal Treasure Island (I know this wasn't directed by Miyazaki but he did do a lot of the visual stuff)
Ponyo
From Up On Poppy Hill
Pom Poko
Taro the Dragon Boy (Isao Takahata is credited with original concept)
The Cat Returns
Gauche the Cellist
Didn't like
Arrietty
The Wind Rises
The Tale of the Princess Kaguya
I need to see this again to give a properly informed opinion/haven't seen it yet
Ocean Waves - only seen it once and it was not my favourite nor a terrible film, I am considering importing the US BD as it has Ghiblies Episode 2 on it as an extra but that will have to wait as neither are top priorities for me, but I would like to see it again, I will say though that I think Tomomi Mochizuki has done better work than this with various non-Ghibli TV series that he directed
My Neighbours the Yamadas
Tales From Earthsea - haven't seen
When Marnie Was There
Earwig and the Witch - Haven't seen
Panda! Go, Panda!
Future Boy Conan/Heidi/Anne of Green Gables/Marco - have only seen about half of FBC and very little of the other three
Unrankable
Grave of the Fireflies - it's such a sad movie that while I do think it's brilliant I couldn't handle watching it very often and haven't upgraded my DVD of it to a BD yet for that reason