I am a little late joining in on this discussion. Since I just bought my '00 RT/10 in Nov, I figured my two cents might be worth a little something.
My friend has had his viper since early 2007 and throughout the summer he tried to convince me to buy one. Finally around Sept Oct 07 I started looking. I did the ebay thing, the exotic car lot thing, and the auto trader thing. Found a few a bit pricey and wasn't real comfortably with ebay or the lots. Late Oct came and I stumbled accross NascarDave's ad on the VCA Classifieds. Long story short, I ended up buying his without even seeing it in person. He was trustworthy being a director of a region of the VCA and had a great reputation from members.
I took delivery and I've been smiling ear to ear since. If there was anything that I learned that I could pass on the another early 20's viper shopper, it's this: Avoid ebay, avoid the lots, be patient and one will pop up with your name written all over it. Trust the VCA members... they are good people and would never steer you wrong.
Glad to see your seeking out an RT/10. These are the best vipers ever produced
. Everyone knows black is the best color! Best of luck with your venture, can't wait to see your status change to owner.