I think most people are around where they're listed.
Paul Pierce was measured at 6'6" in the '98 predraft camp. That looks right. Ray's listed height is at 6'5", though he was measured at 6'3.5" prior to the '00 olympics. Olympic heights tend to be off for some reason. One time they measured KG at 6'9.75." Yeah right!
In all objectivity, I think Ray's about 6'4". Maybe 6'4.5", but probably closer to 6'4".
I had the opportunity to sit a few rows from the court two nights ago (sucks they lost) and Rondo, who always seemed a lot taller than House, is really only about Eddie's height. 5'11.75" was House's barefoot height coming out of college. Rondo's about that, or mayyybee a smidge taller. Maybe an even 6 foot.
The one guy who really struck me as way below his listed height was Leon. I remember Jon Barry mentioning during a broadcast this year that he thinks he's only like 6'5." I couldn't really see it on TV but having seen him up close it's clear he's a lot shorter than 6'8". He looked shorter than Pierce when they were once lined up at the FT line. It wasn't by much but trust me, Leon's no 6'8."