There's nothing inherently wrong with any of the motor homes you listed. I didn't realize there were so many elitists on this site. You want to buy new, and I can't figure why anyone would tell you that you should buy used. Everyone knows you'll take a bigger hit on depreciation as soon as you drive the unit off the lot, but so what. It's not like you're buying it as an investment.
As long as you properly maintain any motor home, it should last a long time.
I'm sure you realize you should easily get 25% or more off the list price of whatever you choose.
Just pick the one that works best for you.
