Hurdlers will always be rated lower than Chasers (as a rule), and Sprinter Sacre is nigh-on stuck-on to put in the best chasing performance of the year, imo.
Given RPRs propensity towards soiling themselves at good-looking 2m performances, I'd want to lay Chelts/back Sandown at current odds, as I'm certain the ratings boys will go a bit daft when SS dots-up in the Tingle Creek. I'd then immediately lay Sandown/back Chelts, safe in the knowledge that they will hang 180+ on SS after he wins the Champion Chase - even if he only beats Magogany Blaze 2L in doing so.......arseholes.
All seriousness aside, SS is almost certain to go undefeated this season (assuming his well-being) and he is almost certain to punch big numbers in each outing (already at a seriously high level). He is also almost certain to punch the biggest of his numbers at Chelts - the ratings boys can't help themselves in that regard. Forget Aintree - they won't award a big rating for the Melling over 2m4f.
5/4 Cheltenham is a stone-cold good-thing, if you're inclined to tie money up for that long.