If you never have anyone in the back and don't intend to start a family within the time you have the GTI, keep looking for a 3dr.
I usually have a lot of friends/family in the car so 5dr is much more friendly and useful in this aspect. Plus I'm keeping the car for as long as possible, so if there's the pitter-patter of tiny feet, I won't have to make stupid decisions like selling the missus and baby (no way am I getting rid of the car!).