I have a Kokatat semi-dry top which has latex seals for the wrist, but a loose neoprene gasket for the neck. Water came in through the neck when I tried it, but not as much as what came in through the waist connection. I've got a new cold-water set up now that I haven't tested yet. When I really tightened down the neck, very little water came in. However, I tried to get back in my boat as soon as I could for both trials and spent less then a minute or two in the water. I can't remember the name of my semi-dry top, but it's made with their Tropos fabric. It's been comfortable and durable thus far, and I got it for either $60 or $80. I don't think I would bother if the wrists didn't seal, but that's just my $0.02.
If my new combination doesn't work, I might drop $550 on a Stohlquist b-pod, which is a drysuit with a special, waterproof neoprene neck gasket. They get good reviews for being waterproof and comfortable.
If my new combination doesn't work, I might drop $550 on a Stohlquist b-pod, which is a drysuit with a special, waterproof neoprene neck gasket. They get good reviews for being waterproof and comfortable.
Also, a little extra room in the knees helps with pedaling, too. 
