Hey guys, thank you all for your help. After reading your replies, I did the following:
Cleaned and polished wood parts with Pledge.
Cleaned keys, knobs and metal surfaces with Pledge Multi-Surface Cleaner (see more details here:
http://www.pledge.com/en-US/Products/Pa ... eaner.aspx
It looked pretty clean from the start, but after performing the above maintenance, wooo is it clean!
SoulSource: I paid $1599 for mine, as it was with the original owner all this time. I had a chance to drive down to the shop to pick it up, so no shipping needed. I wouldn't want any synth, much less a vintage one, passing through more shipping channels than it already has to get to the storefront.
I have kept an eye out for one for a loooooooong time. Must be like 10 years. I let one get away a few years ago. See, it was either buy one from an original owner who kept his put away for decades and it really did look brand new (priced at $1999), or buy a white on white Moog Voyager. I opted for the latter and my decision ate away at me every day. The Voyager was great (sold it in February), but I regretted not buying that Source. The one I bought, when I saw it, made me think, "Oh f*ck, if I let this one get away who knows how long it will take before I find one nearby and in excellent condition." So I took the plunge after talking to one of the shop owner's employees... I mean, it looked great, played great, had the Encore MIDI expansion (which has the aforementioned 256 memories, as opposed to the stock 16), and was a 3 hour drive away.
So, what is a fair price? That's tough to say, but I wouldn't pay more than $1999 for a perfect-for-being-over-30-years-old condition Source. I think my price was just right. But I agree with you 100%... Ebay prices can get ridiculous. Some guy I think is selling one for almost 3 Gs! That's just crazy.
<sidebar> just stepped away for an hour to play my Source... you should get one when you can and the price is right... I'm so glad I did.

Minimoog Model D / Moog Little Phatty TE / DSI Prophet 08 / Elektron Digitone / Elektron Octatrack Mkii / Clavia Nord Wave / Nord Drum II / Clavia Nord Lead 3 / Roland TR-707 / Roland TB-03 / Korg MS-20 / Access Virus TI 2 Polar / Roland SH-101 /:mrgreen: