Add ons
Congrats on getting a great bike. You will LOVE it. Has mins since Dec 00, and has most of the added junque. For the initial shot, I would recommend the ABS - in fact, if would insist on it. It only take once, and anyway, you will recover most of the cost when you sell the bike. Great Safety feature. All the rest of the stuff is deal added.
CB Radio - pricey, but OK is you are a group rider, beats any aftermarket additions. Depends on what you plan on doing for riding. I like mine.
CD Changer - I have it, its pricey, and I like a tack-on Roady XM radio better. Could substitute another MP3 player, also. Not a must-have.
Belly Pan - I have one, can't tell any handling diference, but it has a bunch of dents, and not expensive. Am not sorry about it.
Rear Seat Speakers - Get aftermarket. I have Hondaline, they are not as good as others I've heard, but cost more.
Helmets - Don't go for price. Get what you feel best with, and is comfortable. I prefer the flip fronts, but your choice. I only plan on using it once, and it better hold up at that time. I have an expensive head.
Headsets - Again, go for the quality and what you like. I prefer J&M Modular mostly because of quality and service, others prefer other brands. Just pick one that fits your need, be it music, comm, or both.
Trunk Spoiler - Yes. Nothing like a brake light that is up where it can be seen by the guy behind you. Makes me feel seen when I step on the brake pedal.
Driving lights - Up to you. I have them, use them, but the bike has the best lighting I have ever seen on a bike without adding them.
Backrest - Sure makes touring a lot more comfortable. Utopia seems to the the popular choice, and that what I have. Its worthwhile.
Transformer boards - If you take a passenger, give a second place for foot position. Great aid in their comfort, not worth having if you are a solo rider. Wife loves hers, would not be without them.
Windshield - Honda stock one works pretty well, but others have diferent wants and needs. Wait until you have a few miles.
Jacket - In Arizona, I sure would find a mesh blow-thru jacket for the summer. Likely even an evaporative liner to put in it. We have Joe Rocket Phoenix and Sahara liners. Again, depends on you.
Credit card - a must. HDL loves them.