how rare are power Brakes ?

The original tiny brakes on early A's don't get along very well with the morons out there today driving the BMW's and Lexus' (and many others!) that are so vastly superior in stopping capability at 70 mph. I've got power 12" disks on my '65 and wouldn't have it any other way since I plan to live for a while longer yet. Kept it original for a long time until "Look good, drive bad" just got too scary. I would advise anyone building a car today that will be out in highway traffic to make a serious robust braking system a top priority in the build. If budget constrained then cut corners somewhere else. Too many today are into the cruise night open hood "wow" factor and the job ain't really done.