I have a sea eagle for fishing. 10’ long. Not big enough for OP but has gone three summers so far without being babied. I put a 3hp motor on it.
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If you can afford all that, have you considered a life boat/raft. Granted it has no power, but in that type rescue often what is needed is floatable transportation that could be pulled by ropes, etc.. It's possible an open lifeboat could even access somewhere a power boat can't.
Not only a lifeboat but in addition to other powered craft. ETA: they are cheap and all over ebay. I've seen them for $150 8-Man
An aluminum john boat is a hell of a lot more user-friendly and less maintenance-intensive than a Zodiac/RHIB. And cheaper. I would not buy an inflatable unless you also have enough people to train in maintenance and service and procedures.
Cajun Navy approved!
http://gator-tail.com