For anybody that has an XP Deus, if you are currently using full size headphones and prefer that size I would HIGHLY recommend either the Grey Ghost or Vance's Headphones for the XP. I have both (the full size after market and the small factory ones) and the only advantage that I see of using the factory ones is that you can hear more of what's going on around you (if you're in a place that you need to know what's going on) and they wrap around the back of your head, NOT over the top. Of course there are pluses and minuses on both of these issues.
Personally I really like the full size headphones. They block everything else out and work great. Just something to think about.