Well it sounds like you already keep your car clean so I guess you don't need shampoo's etc recommending?
Have you ever used clay? Clay can make a massive difference, not only to the finish but will also help keep your car cleaner for longer. It makes your paint silky smooth and so less friction (not the correct word but you get what I mean) for dirt to stick too.
As you do not have a massive amount of spare time, I would suggest I very durable wax or sealant, or both really. Going with something like Collinite 476 wax or Wolf's Paint Sealant, this will reduce the amount of times throughout the year you need to re-wax/seal. Then if you add a product like Chemical Guy's V7, this is a spray sealant that you can add each time you wash the car, then re-wax/seal every few months.
Sealing your paint like this with quality products will make cleaning the car much easier, and the V7 will certainly add a bit of shine too.
Hope that helps to start with, fire away with any other questions.
Chris
