I searched eBay for some time and found a newer model of what's in my boat now, new old stock Jensen JMS2212 with a new wired remote and the needed splitter. I have not installed it yet. I get the boat out of storage this week so I'm going to install it soon. This isn't quite what I wanted but for the price I paid I'm not going to complain.
I have tested it in the house, works great! I may add a small 4 channel amp to power some new better speakers. Waiting to see how it works/sounds in the boat first. I don't want a competition system just something that sounds good and is reliable. The new radio supposedly will alert you to a low battery before it's too late... We will see how that works!