I may be to the point were I need to replace my wetsuit this season or next and would like to get some opinions. I currently have a T1 ( bib john and top). I have always raced in only the bib john except once and it wasn't good. The water temp. was in the upper 60's low 70's and I became over heated lost my breathing rhythm and had a slower swim than I have subsequently in the same race with just the bibjohn. All the races I do are in this temp range. The bibjohn is very comfortable however I do notice that it seems to parachute at my chest and I am sure this causes drag. The big selling point was that there is much less shoulder restriction with the two piece which I don't race in and of course no shoulder restriction with the bibjohn. I know there have been a lot of improvements in wetsuits since I have purchased my suit and the shoulder restriction may not be as much of an issue. My worry in thinking about a one piece is that if my experience is going to be the same as when I wore both the top and the bibjohn I would be overheated and out of breath. I am 5 '11 and do not have an unusually long or short torso however I do have a wide chest/shoulder proportion for my waist. Any advise would be appreciated. Thanks, Norm.