I suggest you read this forum, the paypal scam has been covered many times.

Why would you not escrow?

Put your coins in Escrow with a well known trusted escrow provider.
Buyer pays you.
After you have withdrawn funds give the ok to escrow to release funds.

p.s. why not post the address holding the 1.3BTC + a signed message from that address to prove you own them.  Its a good start for a new account to build some trust.