You need to go look. Going from a class B to Class A is a world of difference.
I will speack Newmar. From their low end Class A say gas to thier high end gas is night and day. Now if you go Diesel low end to high their is another hugh jump. Our Mountain Aire compare to my neighbors and very good friends Winnebago and our other neighbor has a Bounder. The finish our Newmar was so much better than the Winnebago and the Bounder. The Winnebago quality of the inside was the poorest. The Bounder was better and the Newmar was the hand down the best. The difference in price was quite a bit from one to the other. Now these were 98, 99, and 2000 units. Have not look at any new units. Our replacement for the 99 was a diesel Wonderlodge LXI. There was not comparing it to the other three.