Great shot, I look at that and it reminds me of a watercolor.
Have you looked into MPix and their different ways they can print images on? I had a cool picture printed on Rag Paper and stretched across a board and everyone that sees it walks up and touches it thinking it is a watercolor. The paper allows the ink to bleed a bit, and really looks stunning.
I think I got a 16"Hx24"W printed and delivered in 24 hours for under $100. I dont work for MPix or get any kick backs, but they are a great little business with a phenominal turn around time.
That shot would look great in a format like that.