When it comes to pow the shape is as important as the size. The shorter ones on my list have more setback and more taper. If where you're going is flatter definitely go for the less tapered and longer ones. If you're worried about speed in the deep then that Slash will keep you going a little better than the shorter ones. Basically they will all keep you up, the bigger they are the better they'll deal with lower grades.
Go ahead, drink that kool-aid.
FS: Forum Sauce 142 $200 plus shipping
FS: Flux SE30 $75 plus shipping