I personally run the Dunlop Elite III and have had no issues with them not sticking in the rain. I dont ride as agressive as some folks on here do, especially in foul weather, but have been pleased with them so far other than the off-key singing when they start to cup. There are several opinions that have been posted on here that favor the Bridgestone's over the Dunlop's for better sticking in the rain. I have never ran a set of Stones on my bike, but may put on a set when these Dunlops wear out. Whatever you choose, check them regularly, keep them properly inflated, balanced and rolling!
I was talking to Goeff Gardisky (Manager MC Div of Centramatic's) he has tried all brands of tires and he said he is really sold on the New Conti-Motions. He has them on his demo bike and has had many people while testing out the Centramatic, state they really like feel of the bike with his set up. So you may want to look into them.