I used Advance Enameling
5849 S Bishop St, Chicago, IL 60636
(773) 737-7356
They charged me $75 for an in-stock color, they have one guy there who's done a bunch of bikes, apparently. They will blast it for you, but of course you need to have it fully disassembled.
Coating Specialties in Chicago Heights is great too. They also charge $75 including bead blasting and any in stock colors. Turnaround time in my experience has been about 4-5 days.
Dan, I'm a powder coater and my specialty is powder coating bicycles. Feel free to call with any questions. I have photos of my work on my chainlink home page as well as on my website.