Bob covered the basics but I noticed something you said...”How much is radar and how necessary is it if you’ll only be out in good weather? “The times that we have used the radar the most have been days that called for good weather, the day went from nice to ugly in a hurry. I look at the electronics the same as more h.p. and tools. I hope I never need to work on the boat at sea, have to get back on instruments alone , or have to out run weather, or salmon seeking revenge, but if I do I want to have the ability to do so. So far we have done repairs at sea (thank you snap-on), gotten fogged in , rained out and snow blind wind all in the San Juan’s( got to love radar) As far as the revenge seeking salmon go It has not been a problem but I am ready.
I would go with the most you can afford, if the wife says it’s too much drive her into a fog bank some time and see how long it take for her to call raymarine when you get back. I have the Raymarine system and so far it’s the best deal out there for the following reason.
1. Others have better fish finders. I like the lowrance finders a lot, but they do not have a chart plotter with a over laying radar which is a great feature on the Raymarine. If you don't like it you can always use the radar as an independent screen. Again I would rather have the ability available then not have it at all. The Garmans are not a choice for me. I was playing with the new one at west marine and just did not like the fish finder screen. I do like there menu's a lot better than the Raymarine but I have grown use to mine and it works really well.
2. Others have had problems running different makes of radar, gps, chart plotter and auto pilots together. Some don't support each other and are hard to install, I like plug and play. Which is where the industry is going, they just have not arrived yet. So for a complete system with fish finder, radar overlay, gps, chart plotter, radio and auto pilot all by the same maker for under 5 grand Raymarine is the only one I know out there.
Now you may not get all that at once but you will have a ability to if you go with Raymarine. Also of note, I have had problems with several Raymarine items. Raymarine customer service has been outstanding. I shipped two components of my auto pilot to them to be repaired or replaced. Both times I called two days after shipping to make sure they got there. Both time I was connect to the THE tech that was working on MY unit. Not some guy with a trouble shooting book of answers or a phone bank guy with a tracking data base and bad skin. They told me what was wrong and what was being done. I got my items back in two weeks or less.
Now as far as fishing goes. If you are going to fish a lot not screen is big enough to read in detail if its at the helm and you are out back. I may (depends on funds, if I can get funds) install a standalone finder in the back of the boat where I can see it. For that I think I would go with the lowrance in color and the best (see funds) sending puck I could get. Also if you fish alone the auto pilot is a god send. Changed the way I fish and how much I and those with me (my poor wife) enjoy fishing.
Also on note, spend as much as you can on a radio antenna as you can. (I need to spend more on mine) a great radio with a bad ant. is not worth much.