If I can offer an opinion......floating VHF hand held radios are pretty much the norm these days, no performance reduction or extra size. Both Standard Horizon, Icom and Uniden make high quality hand held radios. The Standard Horizon HX-150 (this model is being replaced going into the 2019 season but is still a perfectly good radio) @ $99 or the HX-210 @ $119.99 will give you plenty of features for the money and they both float. All VHF hh radios have essentially the same transmit power, some claim 6 watts most are 5w.

The Icom M-25 is a good choice as well @ $136.99