I picked up a Standard Horizon HX870 unit at the significant boat show discount price a couple of years or so back. It was $329. rather than $445.00. Like most electronics it may have got cheaper since then and there may be newer models available.
What I like most about is:
that it floats and is water proof.
transmit at 6 watts rather than 5 watts which was more common at the time. can also be set to two watts.
has a full built in integrated 66 Channel WAAS GPS Receiver with full DSC and distress calling. so if you are in the water and your hands are so cold you can't work it, all you have to do is lift the little red cover and hit the Distress call button which will declare the emergency for you and send your GPS location to the coast guard and others.
you can also do basic gps navigation with it in a pinch.
built in water activated strobe light so they see you easier in fog or at night and draws attention even in daylight.
Lots of other good features on it.