*303 is a construction zone on southern side but will be awesome when complete. I am not sure of the construction at the Sun Valley connection as I have been avoiding this road until complete which should be in 2014.
*101 can be bad during rush hour but is my preferred route when I use in a car.
*another option is go thru Wickenburg via hwy 60, cut south to 74 and come out on I17 (make sure to use the New River bypass near Lake Pleasant). This is two lane but I don't go much over 60mph and it is a shorter route mileage wise with little traffic. It is my preferred route when in the RV putting along. I would avoid going thru Congress/Yarnell/Prescott as it is curvy with grades but still doable. Also avoid 89A thru Jerome.