I agree with you on purchasing a diesel pusher. I also agree with the person suggested you rent one to get an idea of what you might want or need. We bought a diesel pusher with 4 slides out an are glade we did. We bought a 2008 Mandalay Persidio 400 in winter of 2015. and have been on the road ever since. By the way we owned an RV before so for us it was upgrade to a pusher.
Look at all of then don't just settle for Tiffin or Newmar or Fleetwood, or Winnie. Get what you want regardless of who make it.