I've got the Standard Horizon HX851....
Had it for nearly two years now, and it's been used frequently.
Can't fault it, does what I need it to do. (Short range ship to ship communication and calling up Marinas etc..)
Obviously doesn't have the range of a fixed, but most of my boating is done on The Solent, so in an emergency help is often not too far away.
I know there are other makes of handhelds with DSC that also perform well.
.....buy cheap, buy twice- IMHO.