I am with Rolfe on this one.
My old folks got a Mk5 GTI with 18s and it does not cope with their local speed bump and potholes very well. The ride deteriorate further as the car gets older!
I do agreed those 17s does not match up very well with the car. As I use my MK 6 daily, I decide to stick with 17s and see how bad it is. If I cannot put up with it, I will swop it for those gorgeous OZ Alleggerita HLT (17s of course). It weighs 6.35kg. The lighter weight will help my in-gear acceleration and handling (I probably wouldn't able to tell)