Lets quickly look at the current contenders. My thoughts as follows:
Hurricane Fly - the one to beat, but too short. Must be evens alone to even turn up bearing in mind his record on that front the past 3 years.
Zarkandar - won the Triumph, but I'm not taken with him myself. Grandouet had his measure until unluckily brought down at Aintree, and Henderson's yard would be pretty sure on Spirit Son being better than Grandouet.
Oscars Well - slightly unlucky at Cheltenham, and looked to have the race won lto before blowing up, but doesn't quite have the ability for me to win a CH (though should be targeted at it)
Binocular - his time has passed, imho
Brampour - for me, the type of horse who will do better in handicap company than graded races, though this is a belief as opposed to something I can back up, what with him being still unexposed
Behind this lot are Rite of Passage (not a great hurdler and unlikely to be targeted at this), Casual Conquest (yet to run over hurdles) and Oscar Whisky (will go for races over further).
I think Spirit Son is a machine. His win at Aintree was the best piece of novice form from last year, and he will only get better. He only has Hurricane Fly to beat, and I think he will, and that's even if Hurricane fly turns up.
12/1 is the best antepost value you will get this season for Cheltenham.