You might look at Homecrafters, they are CAHPI and ASHI registered and have all the same equipment as Holmes, but I think they're more reasonable. I was happy with them. (I also know the owner and past owner/founder of the company in the interests of disclosure.) A lot of the questions you want to ask inspectors are discussed right on their website including their professional affiliations and history.
http://www.homecrafters.net/team.htm
BTW, with respect to GGG's post, it is true that every company I know does have a limitation of liability clause, but I also know that many carry E&O insurance for situations where limitations clauses are not effective as might be the case for gross negligence.