I have a friend that runs a motorcycle shop that recently bought his own powder coating setup. He was tired of waiting on people and decided to do it himself. He kind of showed me some lessons learned, so here's what I know:
The coating isn't just defined by the powder and electrical charge, the gun also has a lot to do with it. He bought a very expensive gun and the end product is very obviously different. It doesn't have all that orange peel in it. He can powder coat motorcycle tanks and it looks like a professional two stage paint job. Not quite sure how you seek someone out that has invested in their equipment like this, but if you can find someone with a quality powder coating gun, you'll be very happy.
I always get the chassis parts done in Cardinal powder coat color "BK02". It's 40% gloss. Has worked out real well so far.
Here's the rear end housing he just did.
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Also got some color matched powder and have him do my 15" wheels