We did a great trip like that a couple years ago. Flew into Vegas (tickets were cheap), then drove through Death Valley, to the Grand Canyon, then up to Antelope Canyon, Bryce and Zion national parks. We also went to Monument Valley, the Valley of the Gods, Canyon de Chelly, the Meteor Crater and Great Basin national park. It was basically a big loop, but I can't remember the exact order. Death Valley was amazing, as were Bryce, Zion, Monument Valley and the Valley of the Gods. Great Basin was beautiful too.