Here is the trip that we have planned, but since we only have 2 months, we wil not be staying any one place more than 3 or 4 days.
You may want to hit Carlsbad, NM befor Big Bend NP but for us it will be on the way back.
Oregon, Salinas, CA (going to Montery and Carmel) - Santa Barbara - Indio - Yoma - Quartzsite - Tuscon -
El Paso - Terlinga (Big Bend) - Junction, TX - San Antonio - Dallas (for a hockey game) -
Corpus Christi - South Padre Island
South Padre Island - San Antonio - Fort Stockton - Carlsbad, NM - Las Cruses - Scotsdale - Bullhead City -
Sam Marcos, CA - San Nella - Redding - Oregon.
Should give you some ideas here.