Thanks for all of the help. ClemY - thanks for the help on the fusions, I think I'm settled on them. As for chainrings - I have normally run compact or road doubles, but here in philly, it's pretty flat. A 1x is attractive because I don't need a huge range, but also for the simplicity. Weight saved is minimal, but I'm planning to keep the compact double rings and shifter in case I change my mind.

Fietsbob wphamilton and dvc45 - I hear you, and will consider the 8speed options. nice build dvc45, I like the mullet job. What tires are those?

acidfast7 - thanks for the tip. I've got to nail down exactly what gearing I want, but good to hear from your experience on the road with a mtn.