Thanks for the advice ...
Regarding Illinois, I'm in Champaign-Urbana, and there aren't any good basses for sale.
However! I am going to school in Chicago. I was at Abbey Strings one time, and they were just closing. Doh! But I did get to play one of their basses and it was very nice... I didn't ask how much it was going for, though.
As far as what I am looking for. I would really like to have an upright that sounds like, well, my ideal internalized sound.

I mean, like I said before, I love the sound of my bass, it just isn't /big/ enough. I love playing without an amp, but I'm limited by not having enough low end. At first I thought that this was how all basses sounded...
So I don't really care where the bass comes from, what it is made of, etc. It just needs to be playable and sound good. Keeping that in mind... I guess I need to figure out how much I can spend.
So, here's a plan: Put a percentage of my gig money away. After several years I should have enough to be able to afford a wide variety of basses... then I can tromp down to Cincinnati and visit several luthiers in the midwest, tell them how much I can spend, and then play fiddles until I find one that fits.
P.S.: Not trashing the little bass, by all means. It sings in the high registers.