P,
Ten years ago, I used to do a lot of marine radio repairs. Cases and trim levels change but only once in a while are the radios them selves (internal electronics) improved.
The Icom's (of ten years ago) were fair. When they died, they failed from strange things. Had one that would not go into low power. The problem was a failure in the radio's micro processor. The rest of it ran fine, but the micro had a bad bit that woulden't work the 1 watt feature.
Avoid the Raython radios. Yeah, they are slick and look nice, but all the ones I bench checked had this same fatal flaw.
Had one on a sail boat and discovered that the radio would reset it's micro processor because of low battery voltage. With less than 11 volts applyed (common in sail craft) the radio would glitch, and then transmit on 16 (emergency channel).
The Standard Maxi's had mechanical problems. They would flex in their brackets and reset the micro. Made a lot of money resoldering the power control chip back onto the board.
One of the better radios was the Standard USA II (sutable for use in OZ, not a clue). Hard to kill, built like a tank.
The Standards had one problem that was easy to fix, just time consuming. Part of the channel syntho there is a little box. In that box is an adjustment coil. The soldering of this coil is the pits. This is the VCO and when that joint fails, the radios rx the entire VHF band. You will hear cabs, ham radio, police stuff. Resolder that VCO coil and the radio works just fine. It's mechanically a pain but you might find one 'on the cheap' and that will fix 90% of all the flakey Standards in circulation.
Jack Crow in IRaq
Avoid anything that can't take a splash. Copper and salt water do not mix. Avoid bargans. Cheap radios are just that, cheap. Not weather sealed.
Examine the knobs. I don't want to tell you how many volume and squelch switches I have changed because salt water got into the aluminum of the control.
Also look into a premium antenna brand. The Shakespear units were rather good if memmory is correct. Im assuming this is going on a fiberglass or wood pleasure craft.
Much luck
Jack Crow in Iraq