Thanks for the offer, but Hangl = fail. ;)
This doesn't make a lot of sense because you are going to get one set of answers based on peoples' dream board, and another set based on the holes in peoples' quivers. Those are answers to two very different questions. If I could only demo one board it would be an SG 163SL because I already have a Coiler 171 and 185. Is that relevant to you?
If you demo a Kessler, you'll probably love it. But you won't know if you would have loved an SG more, or a Coiler enough to justify saving half the money. If you simply can't get to an Expression Session, then yeah, demo'ing a lot of boards is expensive or not feasible. Then you need to be asking the dream board question, and buy on faith.