If you have ANY concerns with a potential host, you just narrowed your search down by one. Even if 24 hour responses are not the norm for this particular host, it did happen and you can't be certain that it won't happen in the event that you truly need help. My advice (if you were to still be looking) would be to continue your search until you find a host that perfect for you. Host searching isn't really something that you can do in an hour. It may take weeks for you to feel comfortable making a decision.