No, absolutely. As I mentioned in an earlier response, your best resource, really, is a Canadian one, and every single province in Canada has an excellent model to look at. The USOA publishes standards; the IOI provides accreditation and reviews characteristics for ombudsmen's offices. So those would be the natural resources to look at.
The IOA is an organization of “ombuddies”, and it's a very different approach. I would caution strongly to stay away from that particular model, unless you're into shredding and not keeping track of anything, never recommending anything. Their main motto is “Helping complainants help themselves”. In other words, if you have a problem, the problem may well be with you. The first thing is to project the problem back to the complainant. So it serves private corporations very well, but it doesn't help in getting into the public interest of issues.