Those are excellent questions to start a thread about in our Electronics: Communications & Audio Visual forum.
What I've found is the more detail in the question the more detail in the responces....budget is always a good place to start.
S/V Arctic Lady
I love my boat, I can't afford not to!
Welcome to the forum. There are all sorts of areas where you can post on this forum. Just go to the Discussion Board above and have a look. Hard to find some things at first but later you'll be navigating through here like a pro.
The link after my signature is a really great search engine.