ICOM or SH - Floatin Doc nailed it... Don't go cheap on safety equipment!
I have a handheld Standard Horizon HX270 and have been very impressed with it. Will be installing a fixed mount anytime and it will likely be the ICOM M300 (304?).
If you get a fixed mount the limiting factor is the antenna after that so again the limiting factor becomes the antenna. So got a decent antenna like a Shakespeare or Digital.
Best have a good antenna to along w/ it....3ft. stainless or 8ft.fiberglass..stainless mounting bracket to boot..mounted all mine myself, separate battery under console, radio is IN console w/ external speaker...also inside console...vb
Icon and Uniden are good. We've also had very good luck with the Lowrance VHF DSC model with scanning feature. Just use the best and highest antenna you can get regardless of VHF brand or model. If you have a T-top, mount an 8 footer up there and you'll definitely be heard.