I want to buy a wetsuit for my southern caribbean cruise coming up in December. My only other dive trip was to Cozumel last March and I rented a 3mm with a 2mm shortie over it. With only the 3 mm I was cold, especially on the second dive. The water temp. was 77-79 F and I have a slender build. What are the pros and cons with regards to weighting, buoyancy, trim etc. between buying a 3mm full suit with a hooded 3mm vest, versus a fullsuit that is 5/4 or 5 mm? Most of our diving will be in the Caribbean or Hawaii. I am deciding between a Hendersen or a Bare, whichever fits better once the Bare arrives in the mail (the Hendersen fits well). The dive shop owners selling the Hendersen are divided over their advice, as one prefers the two piece method and the other prefers the single piece 5 mm. Unfortunately, i don't have enough experience to make up my own mind, but I really don't want to show up without a wetsuit for this trip. Fit can be a real bugger! Hurry your advice and thank you..............