This thread is making me hungry! One of the very few foods that my wife genuinely dislikes is baked potatoes, so I rarely eat them, but I do love them!
I also second the mashed potato bar concept. I've been to a few events with the concept and they have been wildly popular (and a lot less messy to eat in a social setting than a full baked potato).
I agree with everybody who is saying to go heavy on the bacon, regardless of what you choose! I also love pulled pork on a baked potato.
The other plus thing I heard about going with the mashed bar instead of the baked, is with mashed people can try a lot of small combinations vs one larger baked option. I know at the wedding we were at, lots of people went back up there a couple of times. DD went up once and got the russet with butter, cheese and bacon bits. Second time, she got the red skinned that she stirred in the bacon before topping it with the brown gravy.