You might want to checkout a used version of what we RV with: A 2005 24 foot basement model Itasca Spirit (built by Winnebago) 24V Class C.
I believe Winnebago only offered it through 2006 - in both their Itasca Spirit line and their Winnebago Outlook line.
Construction quality, storage volumes, practical features, and just plain overall value are superb, IMHO.
2005 E450 Itasca 24V Class C