P.S.
I went for the 'tint'.
Had a chat with one of the guys on the S3 forum, who has a Ibis White S3 with this film on, and it looked absolutely superb. Anything above 'tint' and its just too dark for road use for the front headlights. The 'tint' does look pretty dark in some lights too, so I think I'll be happy!
Depending on how easy the application / quality of the product is, I think I'll also buy some for the rear lights - I think its an easy and cheap way to achieve the tint similar to the R32 rears!!