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Being previously in the electronics business, AJR you are correct in that Radios and other sensitive electronics should not be wired with other accessories.....there is absolutely nothing improper though with wiring them to a bus bar and that in fact is the proper way to do connect them. As long as you run a heavy enough gauge wire as your main power supply and ground from the battery, you will not see a drop in voltage. You will probably have more problems such as shorts, humming, motor noise and feedback by running multiple wires from the battery to each unit. As Kamie says, run more than one Bus Bar in order to have individual connections for each apparatus, but there is not need to complicant thngs. You will in fact more than likely cause greater peoblems by having multiple connections on the battery. Keep it simple :D
PS
Look at the last photo on my personal page. That is just on a 15' Sport, but one main line comes from the battery and then to the Bus Bar and from there to each piece of electronics
In my opinion the negative or ground connection is just as important as the postive so I run a bus for the positive connections as well as one for the negative or ground connections.