If you do get hermits I would go with the blue legged. Also if the hermits are small get them some shells, otherwise they might kill larger snails for their shell.
Thanks! I've been doing some reading and if my LFS has the snails they say they do I might get 2 nass and 2 trochus. Then just wait on the hermits. They seem like they might just fight for competition and shells. If I do get them I'm definitely going to ask the store for some empty shells for them to try to mitigate the slaughter.