For a first suit I recommend open cell in, nylon out. Depending on your budget I suggest
Eliossub and a custom suit. Price is less than most off the shelf suits and they are custom made and fit perfectly. The Elios suits are also tremendously sturdy and well made. My basic and oldest suit is a 5 mil black shadow neoprene suit with superstretch nylon out and what elios calls 'new black' coating over open cell in. It is incredibly sturdy and I have used it year 'round here - in water temps down to 3c. My dive buddy has a less expensive titanium lined suit from elios - with nylon out and he also dives all winter in it. Email Elios with your requirements and they will give you a bunch of options. My basic recommendation is
Heiwa neoprene
Open cell, titanium or new black inside (depending on what you want to pay for - the coatings inside make the suit a little easier to put on - but you still need lube - you can save a fair amount of money by just going open cell)
Nylon out (superstretch is fantastic - but any of them are fine.
