Well I'm not big on poetry, my taste seems to be very coarse. Most of Rilke goes right over my head. But then again, some I have a deep appreciation for.
Hesse was a great stylist in my opinion. He isn't very deep, but his prose is enchanting and has something dream like to it – his novels are a mix of poetry and prose. But if you've read one Hesse novel, you have read them all.
Another good one is "Steps" – if you haven't read that yet – and some of his essays are great as well.
So you don't speak German? somehow I got the idea in my head that you were German.