Nope, we'll have it in the office at all times. It should be fairly portable - we have visiting speakers who like to use their own laptops to connect to the projector.
if it is in the office and presumably in the same room, why would you make it portable? Just go fixed installation.
The reason is the stuff marked as ultra-portable are compact first, functional second.
Also, how big a room and how big a image size do you want?
Lighting condition when projecting, are you able to turn off some of the lights if not all?