Cam's right... without a meaningful electrical budget, can't really say much. The lights could vary quite a bit, halogen vs. LED is a very significant difference in power draw. Same for the nav lights and so on...
While wiring a Raymarine autopilot into the existing system might be a just a bit simpler, especially if you're going to do it yourself, there isn't that much of a savings to make sticking with Raymarine your only choice. Especially since Raymarine has an abbreviated warranty on user-installed gear in some cases... and the more advanced autopilots may be included in that list of gear.
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You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.
—Cpt. Mal Reynolds, Serenity (edited)
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Still—DON'T READ THAT POST AGAIN.