I have read that if you subscribe to Cox's Business class service the usage limits are much higher than the Residential service usage limits. Business Internet Ultra for Home Office might be your best value. »ww2.cox.com/business/arizona/dat ··· cing.cox
I used Tempe as the city just to get something in Arizona. Make sure to get the exact city and service address checked as some areas may not get Ultra yet. You might have to settle for Premium.