Double, triple check whenever you want to purchase expensive stuff over the internet.
Also, if the deal is too good to be true, you better watch out and be extra careful.

COD will be the best way. Always remember DO NOT simply bank in your hard earn money into someone else account especially someone that you can't trust. Once bank in, hard to get back, most of the time, will never get it back. Even with positive ratings, also have to check where and who the ratings come from, those people who gave positive feedback genuine or not.

Report to police and ebay, if he's on Lowyat, try PM one of the moderators to get him on this thread (http://forum.lowyat.net/topic/1579999) to avoid future buyers to be victims again.

Another tip is to google the account number, full name, phone number, email or any other details before banking in next time in case there were similar cases before.