If you're not living in Santa Catalina or Manzanita, the truth is that your room is going to be pretty tiny. I'm not sure of the exact dimensions, but you can see the UCSB suggested layout here:
http://www.housing.ucsb.edu/hchoices...fp-anacapa.gif
You could probably get away with both items, though I guess you can bring one your first quarter and depending on the layout you and your roommate decide on you can adjust after that.