Porco Rosso wasn't an option so I went with Spirited Away. I haven't seen Princess Mononoke in quite a while though. I'm sure I'll still like it. Beyond Miyazaki, my favourite Ghibli is Whisper of the Heart.
I enjoyed Howl's but I never understood how ride or die some fans are are over it, so seeing hate for it is weirdly cathartic even though I don't agree. I'm absolutely nuts over the novel though..