3rd row and sunroof
On a Limited you can get 3rd row and Xreas, so the two systems can be ordered together. You cannot get a 3rd row with a sunroof because of the headliner clearance for the 3rd row.
In '03, the SE's were equipped standard with a sunroof and Xreas (and some other options). In '04 and currently, the sunroof became optional on the SE, but 99% were still ordered with the sunroof. Toyota figured that if you wanted the Sport Edition it wasn't going to be a grocery getter, so the 3rd row was not offered as an option. They figured it you wanted the 3rd row and Xreas, you would order the limited.
From my experience, it depends on what part of the country you are in (or in Canada), because the options vary greatly. In the Southeast, you can order an SE with Leather interior - which is not available anywhere else in the country.