Powder coated rims will hold up fine. Just make sure that you have UV protection in the powder coat unless you want your rims to chalk. You do realize that all the cars running around with hub caps have powder coated wheels under them do you? All ATV, and gold carts have powder coated rims unless they are chrome or billet. On a side note, powder coat will hold up much better than a painted wheel, its just harder to touch up.
I know the voices aren't real, but they do have some good ideas.
I want to die while asleep like my grandfather, not screaming in terror like the passengers in his car.