I've only got a MkV GTI. Its Tornado Red, 5 door, DSG, Xenons, Cloth, 18" Monza's. I've got a toddler and find the 5 door really practical. It's really easy to get him in and out of the car seat. It's really easy to load the rear seats with stuff when we go away too.
I'd recommend the Xenons if you can afford them as they are brilliant. They are really bright and full beam is like day time. Really good for dark b roads. Only problem is that it can dazzle oncoming drivers as they are so bright.
I don't think I'd get a Mk6 as my car is only 2 years old and it wouldn't make economic sense for me to get one now. I still think that it is too similar to the Mk5 anyway to upgrade to. I'll probably wait for the Mk7 by which time I might have some more money to get a new car.