Escrow is a possibility. My reputation can also be taken into consideration. I've got over 2,400 posts in this community for over a year now.
In Bitcoin, we call that the "long con"...
How do I know that I won't be scammed though?
How do we know we won't be scammed. Your choice of forum nick leads one to think you don't plan on sticking around to when you're not a newbitcoinqtuser.Alternately, you can use escrow. The person you wish to trade with can send the 1BTC to the escrow agent, who will only release it to you when the bitcoin seller receives your unreversible funds, such as cash or USPS money order in the mail, or western union.