Nice road trip report.
I'm surprised you guys didn't like Fruita, between it and Moab I'll take Fruita any day of the week. I will say that the trails outside of 18 Road are the highlights of the area. When I've gone there we typically hit Zippety, Kessel Run, Chutes and Ladders, and Vegetarian as end-of-the-day trails. You can spend all day there, but the technical and scenic gems are on the south side of the highway. I much prefer the Grand Junction Lunch Loops and the many offshoots from the Kokopelli Trail. Stop in at Over The Edge next time you are in town and you'll definitely get some help.
That said, your write-up has me interested in checking out Moab again. I wrote it off years ago as over-priced and over-crowded, but maybe I need to revisit the slickrock Mecca.
Idaho certainly sounds amazing though, I really enjoyed the riding I did in Moscow back in 2007, I should probably go check out more of it.