Well, people were so nice here helping me through my compressor/power woes, I figured I would let you know how it turned out.
After over a month of waiting for word from the power company as to what their decision was going to be on my being able to get 3-phase, they called me back yesterday.
They are willing to supply me with 3-phase power, but since they will need to put a transformer on the pole, they want me to put a deposit down to guarantee 5 years of service from them. Over the course of 5 years, they will credit me for the distribution part of my power bill and at the end of that time, they will pay me back the portion of the deposit that actually used. As in if the bill was $200 for one month, about $75 of that would be the distribution charge. After 5 years, I could get the $75 portion back. And yes, that is what I would have to use each month to get back the $4500 deposit they wanted.
So, while I was thinking about it, I looked on ebay and found this:
The 10-17HP seemed weird, so I called Baldor up. Turns out it is a custom built motor, and from the data package they sent me, it appears that it actually just a 15 HP single phase motor with long leads and a funny way of stating it. But it should be able to run continuously at 15 HP, which is what I need to run the compressor. (For those that weren't paying attention, my compressor is actually a 20 HP model, but the motor was replaced with a 15 HP one, which Quincy says will work, but a 10 HP motor will not.)
Well, for $107.50 + shipping (probably about $200), that seemed a much better deal than $4500, so I went for it.
I'll have to make some adaptions to fit it, since it is a slightly different frame and shaft size, but it looks doable.
Thanks again everybody!