Portable inkjets don't tend to save much space in use. They kinda have to spread out to run. And their ink is hella expensive.
A regular inkjet that can be loaded from the front (that is, not using a top-loading paper path) can be shoved in a shelf to save space. I'd recommend a Pixma iP4200 or 5200, which has both top and front loading paper paths.
tooki