Echoing others' advice to try driving one to make your decision, everyone's body and definition of "comfortable" is different. Adding my own experience as a tall, new Seven owner to hopefully convince you.
I'm 6 ft 3 and fit comfortably in in my long cockpit S3 with stock leather seats (which add a few inches off the floor and a few inches depth-wise, so I would have even more room in a smaller profile seat. Will be replacing with a poured seat soon).
However, my head clears the rollbar by a few inches even without a helmet. My brother is 6 ft tall and clears the rollbar by even more than I do! Height doesn't really tell the full story since the ratio of everyone's torso length to leg length is different.
I sat in a friend's SV with lowered floors and still didn't clear the roll bar. So, I'm currently getting a custom roll bar fabricated.
I am able to drive fine in a pair of old Vans (size 12), but will be getting racing shoes before the weather turns.