As the others said, definitely stay off site. Perhaps halls for the first week or two to meet people and decide who you could and would live with and vice versa :-)
Then move to Kidlington or Woodstock. I would recommend Woodstock over Kidlington if you have transport as the social life is better (personal opinion, having lived in both)
You can rent a 3 bed place for 800-1000pcm (between you all)against the halls of approx £180 a week !! (full board) and as you will be a full time student , no council tax to worry about.
I feel it's important that you can get away from the airport as it becomes a bit too much of your life and unfortunately many of the residents in the halls don't respect that you are busy and have study to do, so people charging around loudly and selfishly is common.