Standard Horizon Portable radios
I would spend the extra money and get the Standard Horizon Hx 470 Submersible.
Very tough and reliable radio. I have no problem hearing the admiral down at the lighthouse. He is certainly not easy on the radio either, I wish I could get paid everytime it hit the pavement in the parking lot, plus he has dropped it in the water a couple of times down stairs.
Pay the extra once vs paying for a few cheap radios, that is what I have come to realize with the portables we use.
Check out Boater's World and Consumer Marine Electronics both have web pages and will be running specials with the up coming boat show in Boston.