Ours are 8 feet. Its a walkout basment. Actually, one side is 8 feet plus 1/12 inches do to a stepdown upstairs.
Go to
www.armstrong.com and take a look at their ceilings. They have some plank and tile ceilings that take about an inch off of the overall height. They look much better then a dropped ceiling, but don't appear to offer the same kind of access if you need it.