As others have said, its a Amtran Genesis.
I have the 30 foot version with a wheel chair lift in the back (which I think is about the size you are looking for).
If you look at the height of the drivers window and the windows for the kids, they are the same height which I believe is a standard height bus. If you are already planning a roof raise it doesn't matter. If you are short like me, I hope that a high ceiling bus like mine (windows behind driver are higher the driver window), it will allow me to insulate without hitting my head or raising the roof.
Blue bird makes some shorter TC2000, which is equivalent to this, but longer TC2000 are more common. The TC1000 is about the same length, but with smaller wheels which allows them to do a flat floor which I wish I had. I think there a Thomas Model that is equivalent to TC1000 as well, but don't remember the model number off hand. And I am sure they probably have a full sized Type D that could be ordered shorter like this as well.