I think we can transact safely if we get services through Escrow.

Escrow service consists in escrow.com. Here is place that can believe most.
Escrow.com.

For your information, please note that the transaction
procedure through escrow.com is as follows;

1. You and I register in escrow.com

2. You transmit money to escrow.com

3. After I receive confirmation on your payment from escrow.com,
   I transfer my ownership of domain to you.

4. After you confirm the transfer of ownership into you and inform escrow.com of the fact,
   escrow.com send me money.

You can access more detail information on the transaction
procedure in http://www.escrow.com.