The one Cal supplies is pretty huge relative to the space you have. So any one you buy will be great. I'm buying a 3.1cubic feet. My dad wanted to get the 4.5 cubic foot one but it was sold out. I'm in a Stern double and the room is a little longer than the units, so my roomie and I visited the dorms at separate times and figured out that a 4.5cubic foot was perfect.
It also depends on your room obviously. If you're in a triple, you can have two mini fridges and if both of them are like 4.5cubit foot you might have a problem.
Edited to say that the one Cal lets you rent is 3cubic feet.
Last edited by arduouspallor; 08-17-2009 at 04:25 AM.