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$1,000 isn't "real expensive" it's outrageous it's stealing. Bring it over and I'll do it for $50. But like cleep1700 said $200 seems reasonable for a "professional" installation.
Like Garris said I would do it myself especially when you said you have hardly any electronics currently installed so it should be clean to do. Check YouTube https://www.youtube.com/results?searc...stallation if you have doubts of doing it yourself I'm sure there is a video of how to install a marine radio.
You could even check with a local stereo supplier (Best Buy) as they mind be able to give you a good price.