Depending on what your goal is:
Safety(first):
- Replace the IRC stock tires with not-IRC(tm) tires. The tires that are not-IRC(tm) tires are darn good tires
- 90 degree valve stem on the rear wheel to make tire pressure checks easier.
For longevity:
- Verslavy CCT
- Raptor Petcock.
- replace "phillips" screws with stainless hex fasteners (carb, side covers)
- Consider getting rid of the chrome head covers. They serve no purpose.
- Pull the brass plug covering the idle mixture screw. It infringes on your right to adjust your idle mixture.
Comfort:
- Raise the seat height 1 inch.
- Forward controls.
- Install one of the recommended fixes to mark your last fill up. (bike computer, grease pen, luggage lock, knit counter).
There is no "Economy" category, you won that battle when you bought the machine. Now it's all about making it to the "Mileage Hall of Fame".