We bought a 2006 Dodge Sprinter Van and added a lift. This van has high enough doors and ceilings (for head space) that it needed no modification. We also were a family of 7 and this van gave us enough room. Now we only have 5 and thinking about getting a mini van with a lift or a ramp. This is also a diesel van and gets about 25 mpg.
Don't forget the MV-1. http://www.vpgautos.com/