Doug,
I started a thread on a similar subject a couple of years ago and the concensus seemed to be that good manners and tradition dictate everyone plays from the set of tees picked, in order of priority, by: a) the host, b) the shortest player specially if age is a factor, and c) the majority.
Personally, I prefer that everyone hit from where they are comfortable provided that it doesn't sacrifice safety as well as the speed, continuity, and spirit of the round. I've played in groups using three different sets of tees with no problems.
I also generally prefer playing the back tees so long as the course is under 7200 yards at sea level with some roll. In neutral conditions, my drives probably carry 225-230 yards, so I am now a medium-short hitter. From this distance I get to use all the clubs in my bag and I get to see the whole course. When I can't reach the longish par 4s in regulation with a solid drive, I'll know that it's time to move up.