Take yourself back to when you first bought your bike.
What would be the ABSOLUTE first thing you'd install?
Right now I'm torn between a dash and an LED conversion kit. I'm not rich so doing everything at once is completely out of the question. Plus, the wife wouldn't like me spending that much money on something that was supposed to save money.
You rack up some miles and buy/see what you want, that's all that matters. There are so many who turn these bikes into what looks like a serious off road capable machine, and they won't even ride on gravel because they don't want their bike to get dirty. LMAO
If I was in your situation, the first thing I would buy is a top case. Not only do you need some sort of storage but your wife can use it as a backrest. The more she enjoys riding with you, the more receptive she’ll be to spending more money on the bike.