With you having a single itrader I would probably ask you to push the domain first especially if using PayPal. However, if the seller (you) were uncomfortable with it I would ask that we use a different method such as Escrow or something that protects the buyer (myself). Ultimately what you choose to do is your own choice and should be made on factors that surround the buyer. Who are they? Do they have a reputation that supports them as a legit buyer? Whats the chances of them not paying you at all? Whats the chances of them doing a chargeback?
I have personally bought from Mrs Jello but have never sold them a domain so would I push a xxxx domain to them before receiving payment even though they have several itraders? No I would not. While I would push a domain to say John, Acro, Adam, James, or many others that I have done business with before receiving payment. But that doesn't mean that many other members here wouldn't do it. Its a personal choice that you must make alone.