If That's What You Want...
Welcome aboard the RoadTrip America Forums!
...then that's the perfect route. The single most enticing aspect of the 'great American RoadTrip' is that you get to go where you want to go. So if your planning has led you to this itinerary, then it is exactly the RoadTrip for you. You have left yourself plenty of time to savor the sites, events, and people along the way. If you could share your interests and/or what led you to these choices, we could perhaps offer a few hints as to what else you could add to what you've already planned.
AZBuck
Like mountains and scenery, why stay in City's only ?
If you have done your research and the route you have chosen is the one that appeals the most then as Buck said, that's the perfect route. However for mountains, scenery and National parks then heading through Colorado and Southern Utah into Arizona takes some beating. Some, of many NP's would be Rocky mountain NP, Arches, Canyonlands, Bryce, Zion, Grand canyon along with some great driving roads and much more. I am also confused why, if the above appeals to you as you say, you are spending all your nights in City's ?
You will find lots of info digging around the forums and visiting the planning pages, found in the tool bars above.