Powdercoating will be fine as long as the process is done correctly. There is a list of recommended places on here somewhere, possibly in the FAQ section.
I had my Rays powdercoated in satin black a few weeks ago by BJV Engineering, for £200 (on a GM car). That included dropping the car off, having 2 new rear tyres fitted, and collecting it 3 days later. Excellent service. They even dropped me at the station.
Fitted some black wheel nuts and it all looks
Pics to follow...