I had to vote for Sacred Sites, although, judging from this thread, it's definitely not going to win anything! The artwork isn't the most fabulous, but the concept and execution of it are great. My favorite decks are ones that make me study!
I also like the Incidental very much.
But for straight beauty, my REAL favorite is the Wild Unknown. (Shh, don't tell Sacred Sites!)
I kind of like not being right in the middle of the mainstream here!