I agree with the southern route home along the border. Too early in the season for the northern route. Bisbee is a cool place as I visited it last May on my trip to PHX. Maybe: PHX/Bisbee/El Paso/ Carlsbad etc. Pretty desolate and uninviting around Carlsbad and West Texas. Vast oil and nat gas fields. Big winds too. I am flying into PHX in 2 weeks to ride my bike back to Boston. Am taking the central AZ/NM route: PHX/Payson/Show Low/Springerville/Quemado,NM/Lava Beds/Grants/Albuq. It's all two lane, but I need to make Taos the first night so won't be sight seeing much. Luck!