Hi Parker,
The joe hunt magnetos have a good reputation but as you say they are expensive (around $750 - $800) This is all you need for your ignition system.
However to run your lights, horn etc. you will still need an alternator and voltage regulator, a battery is not necessary .
If you were to go down the standard route with new coils, electronic ignition, new alternator, a voltage regulator and (if you want) a battery. it would cost you about half the price of the joe hunt. It's still a very simple system, even an idiot (like me

) can wire one up!
Webby