Michael, I had a new fork built by Ralph Ellis at Ypsilanti Cycles a few years ago. It was way less than $400 as charged by the well-known builders like Mitch Prior and some other big names, has the custom features I wanted, meets my length/offset specs, and rides real nicely. Ypsi Cycles can be reached at (734) 482-7881. Not the grandest of materials (blades are Dediaccia Zero, I think), but it works quite well.

He might be willing to do the cutting/boring method suggested by Scooper, as well.

But there are a lot of good choices out there.