Good news:

I found motorcycle/industrial powdercoater in San Antonio who said they would two color and clear coat for about $100. They have a guy that will sandblast the frame for $25. (Better than Spectrum's $600)

I don't think I can beat that, especially since I won't have to pay shipping now. Materials would probably run me that.

However, I'm certainly going to keep in mind all the tips here. Next week I'm taking the frame to them, and perhaps they'll look and get gun-shy, since they don't actually do bike frames.

I'm so excited to get this thing refurbished!!