The sizing on the website I find to be accurate, although if you want to be sure do what I did, since my torso length / leg length proportion is a bit out of the normal range. I emailed Emilio (De Soto) and he had me take several body measurements and then recommended a size, which fits me perfectly. The customer service at De Soto is outstanding.
You will be faster in the T1 bibjohn than in the speedtube, and in the full (sleeved) T1 pullover than in the vest. I have the Full T1 First Wave Pullover and Bibjohn, and the 5mm Speedtube. Since I do a fair amount of open-water swims by myself, it's handy that I can zip the top closed without assistance. The speedtube has to be pulled all the way up so that it is very snug in the crotch and the drawstring tied tightly or it gathers a bit of water inside and balloons a bit. The full wetsuit is quite warm, and well suited for cooler water.
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2007 QR Lucero
2005 Cervelo Soloist