I have a few questions for the Hoka One One wearers out there. They are sold out in the REI stores around me. If I order on-line, what model should I try? How is the sizing? I wear an 8-8.5 in street shoes and a 9.5 in Asics. Also, could somebody recommend a site for ordering that would be good on returns if I don't like them or need to exchange sizes? Thanks!!