I've had very good dealings with the people on Audiogon as well. One must always be wary of scam artists.
Usually the folks who are legitimate won't have a problem giving you their real names, phone numbers and addresses which makes it a bit easier to check for validity.
Sticking to credit card payments through methods such as paypal may cost that extra 3% but it is worth having the buyer protection provided by the credit card company.
"Those who preach the myths of audio are ignorant of truth."