A lot of non SEs (especially MKIIs) have sunroofs as extras anyway, and if you want lighter this is where most of the weight is.
I used to a own a non SE and it was great I loved the simplicity but now I have an SE and love the toys...
I think however, most look for an SE.
Point to note is the tax so cars registered after 23/03/06 are in the new tax banding and thus it is approx £200 more to tax