I've had pretty good luck with the basic wired Cat Eye computers. I've had one since 2004 and another since 2005 without a single hiccup. They are pretty water resistant. I've commuted many times in the rain with them.
I've never used a wireless computer. With good wire routing and a little care, I haven't had any problem with damaging the wires. No need for the extra expense and potential interference of wireless computers, in my opinion.
Last edited by Spld cyclist; 04-09-12 at 06:01 PM.