I've just listed my two last antique coins on eBay.
EBAY!
It's still the easiest and safest way to make an auction (As far as I know)
...but expensive. Paypal+Ebay will steal close to 20% of your sale price.
Sold a few Panda's on ebay recently and it was a frendly reminder to me how expensive their service is.
The positive thing is you get broad audience and a very nice seller interface, but at a too high cost (imo).