I dove NE out of NJ for 20 years before moving to FL -- so I thought this prospective might be helpful. I dive a 1 mil in FL for shallow dives during the warm months and a 3 mil for any other time and anything deeper than 100 fsw. I was never comfortable in anything but a dry suit in the NE except in shallow water during the mid-late Summer. That being said, you may want to wait on investing in a 5 mil wetsuit in an effort to find a solution for both locales. Rent first and see if you are happy. If you are going to do a lot of NE diving you may want to go with a dry suit and keep your wetsuit/bathing suit for the tropical stuff. Diving dry is nearly as valuable a skill/technology as Nitrox when you are diving in cool/cold waters, IMHO. Also, this will open up the opportunity to dive more months in the NE.