Erie Insurance Company is a great company (they are one of my carriers). However, they are not in Arizona. Currently they write business in only 11 states and the District of Columbia–Pennsylvania, Illinois, Indiana, Maryland, North Carolina, New York, Ohio, Tennessee, Virginia, Wisconsin & West Virginia. Also FYI Erie Insurance Company does not mind old houses as long as they have been updated and are well maintained which is true for the majority of insurance companies.
If you are not in a state served by Erie Insurance, you might want to check into Travelers Insurance since they are licensed in all 50 states and the District of Columbia. They are highly rated and have been in business since 1864. We also write insurance through them & from personal experience with my own homeowners insurance and through clients the claims process with them is among the best offered in the industry. Visit their website at http://www.travelers.com/ to find additional information and a local agent.