If i were you, I wouldnt buy a preowned console and if you want to have the whole Xbox360 experience, I recommend you to get the premium (special edition) Xbox360 and if you wanna explore Xbox live, get the Xbox live gold membership card along with Xbox live webcam and USB keyboard and pick up a few good games for Xbox360 such as Dead Rising, Prey, and Dead or Alive 4.
Now, since the holiday season is around the corner and the Xbox360 is around $400, are you extremely sure you want to buy that for your boyfriend since it's still pricey? If you want to buy a new one at a better price, I suggest you to wait a year later for the price to drop to about $350 or so.
Of course this isnt my business but just giving you a little recommendation is all...it's all up to you now and wish ya the best of luck to bring happiness for your boyfriend.