There is only $2300 difference between a 90TSI DSG with Comfort Pack, and a 118TSI DSG. Since you already were able to obtain a ~10% discount on your car, I see no reason why they couldn't supply you for the 118TSI DSG in Candy white for only $2k more... so $32,000 drive away.
As for the cooling off period, the only way to tell is to actually look at the papers you actually signed.
However, even if there isn't one, giving the dealer a phone call and asking whether it can be switched to a 118TSI can't hurt. Dealers are often accomodating to customers who are waiting to swap for a higher model - as long as the deal hasn't gone too far or involved some technicality or financial outlay for the dealer already (having to purchase the car themselves, swap with another dealer or something like that).
Either way, I think you'll be happy with the 90TSI or 118TSI. But if you're having 2nd thoughts now, and you can afford the additional, don't sit there, call the dealer NOW!

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