I live in the UK and advertised my Dart on the Dart UK website... then I got a strange sounding phone call from a foreign chap, followed by an email who's address didn't match the caller's info. I took it with a pinch of salt, but finally established that I was dealing with a co-owner of the soon-to-be importer in Portugal. I was somewhat wary - not least because Portugal and the UK have two countries and the English Channel between them! I was then able to verify his details by a web search and email to a mutual contact. We met in the UK, where he'd come to collect 4 or 5 boats in a single trip. He paid cash. Moral -by all means be suspiscious, but it could well be genuine. I would insist on some form of references, and Payment through Paypal would definately be one option.

Good luck,
Simon