Electrical will have to be up to code which is going to be high quality. One this to do is add as many outlets as you want. I put outlets behind tvs for easy plug in to hide cords, more down low (a 4 pack outlet) for any cords for your entertainment stuff so you don't need a surge protector.
If you want can lights now is the time to do them.
Make sure everything is LED or make sure you can buy the bulbs or cans or lights so they are LED to start.
If you are into any welding or bigger air compressor get a 220 or two of them put in your garage. If you ever want to buy an electric car make sure there is power there for it so you aren't plugging it into a 110.

Think about your furniture, in the living room do you have or want a couch that uses power for outlets USB or power recline. If so get an outlet put in the floor under where it will sit.
Make sure your wife is happy with enough outlets in the kitchen to plug stuff in.
Have them put in ceiling fan ready mounts in all bedrooms and anywhere else you might consider putting a fan.or spend the money now and get the fans you want as they have to put something there so it might as well be them doing the work.