Budget?
I guess it is safe to assume you don't want to make a this knife (your tag says hobbyist knife maker) ? Due to the wet environment, I'd pick stainless over high carbon in this case. Unfortunately, stainless is much less common at 7"+ in the survival camp genre then high carbon unless you want to drop $200+ it seems.
Again, depending on how much you want to spend and the materials you want, I might just contact a knife maker on this forum and ask for a 7" camp survival blade in stainless.
I've owned a BK 7 and 9 and got rid of both. Great knives but just too big for my general camping/survival needs. Good luck.