Avic7: Don't really know what all these mouth-breathers are talking about with the shaving the neck deal. I've had hair down to my shoulders for the last ten years on and off and I can count on one hand the number of drops of water that got in through my neck seal.
One word: neoprene. Warmer, tougher, easier to maintain and it'll last longer. When it gets too tight, stretch it out over a tank for a few minutes.
It's the answer. Also, a good hood that fits properly over the neck seal will help greatly.