I have done a lot of research on VHF's and have come to the conclusion that without any doubt the 2 best brands are ICOM and Standard Horizon and I would go out of my way to buy a SH radio, not particularly for the radio but for the quality of the Company service.
I had an old SH Intrepid on my boat and I was having troubles with the DSC. The radio is almost 10 years old and WAY out of warranty. I called SH and they answered on like the second ring and told me to send it in.
Within about 10 days the radio came back, no charge, with the dsc board and a new pigtail installed, and all the other functions checked out.
I've also had 3 different Uniden's and while they have been decent radios, Co. service is awful. Suggest before you get one you try and call their service dept. If you can find a number, I'll bet you choose other before you get a phone pick-up. Not ragging on the Co. just passing along one persons first hand experience.
At any rate, the inexpensive SH's are the Matrix and Quest, I believe (a standard no fault 3 yr. warranty policy). Try to get a Class D radio, I think everything except handlelds are dsc.
I have a Uniden UM525 on the boat right now and it seems to be a good radio, with a very big screen and a good 25 watt, 30 ohm Hailer. I think the westMarine 525 is a rebranded Uniden 525 and at least you would get someone to talk to there. But if my current Uniden develops a problem, I am going to consider it a throwaway, and go back to my SH. Some of the SH execs are former Uniden guys who left because of the service policies.
Good luck, you might want to call ICOM first on your old radio, they also have a great reputation and you might be pleasantly surprised.
http://www.rivermarinesupply.com/xcart/ ... Radio.html
Good luck, Chris