Whatever you do, take care of the seals. Although I've been fortunate to never have had a failure while in use, I've learned this the hard way. Wash the seals with soap (especially if you suspect you may have gotten sunblock on them) and use 303 protectant on them. I have just discovered that I have to have a third neck gasket put in my kokatat because it is melted from some sort of chemical reaction.
I have both a Kokatat and a Gull dry suit - both are breathable...the Kokatat is Goretex and the Gull is something else. I can tell you that the Kokatat is much more comfortable and has held up better (except for the seals which is my fault). My Gull is leaking slightly at the leg seams.