I will be backing last years winner Comply Or Die (but with less confidencce than last year), so at 20-1, I would make this an each way shout, along with Darkness @ 22-1. A lot has been made of an animal by the name of Butler's Cabin because he is being ridden by the main man A.P.McCoy, but I would overlook for My Will, which ran a great race in the Cheltenham Gold Cup and will probably start favourite.
So, in short: to win: My Will.
Each way: Comply Or Die and Darkness.
Good luck.