Thanks for the suggestion on Eco. I picked up a few books by Fernando Pessoa too.
Pessoa is fascinating. I believe it was he who wrote:
Poets pretend
They pretend so well
They even pretend
They suffer what they suffer.
... something that lodged itself in my brain years ago and never left. Pessoa wrote under countless pseudonyms. He is like Kierkegaard in that respect. You might like Fear and Trembling, in fact, based on your list.You might like Gormenghast: http://en.wikipedia.org/wiki/Gormenghast_(series)
Wyndham Lewis's novels, especially the Human Comedy that he wrote at the end of his life, are something I've always been meaning to get to. It's hard to tell if they're meaningful or impenetrable.