I don't think you'll find a 'good' bath/shower in any class B.
There is the Rialta (from Winnabago if I remember correctly) which I really liked except for the price. Then there is Pleasureway and other such 'van camper' specialists. As a final option, you can have Sportsmobile make up whatever you want.
I would recomend the Chinook though you can't get a new one anymore and they are kinda pricey. If you don't mind an older one the Mobile Traveler was a good one. Or if you want a small(real small) class A the old Cortez was a nice rig.