I don't have to prove anything other than the fact that the contract was not satisfied.
This is the exact point I made, but you must prove damages caused by the buyer breaching the purchase agreement, otherwise what are you suing for? Your not going to tell me your suing for the $7K are you? Your dreaming if you think the court will enforce the contract, that's just not how it works. When you sue, your asking the court to compensate you for money you lost, and since you haven't lost anything, you have NO CASE... You can ask for punitive damages, but you must show that you suffered as a result, Good luck with that one.
And CBK is exactly right, you need to sue in the County where the defendant resides.
It sucks that you lost the sale and you have every right to be upset, but were dealing with people who hide behind a computer screen, You cant tell me you weren't aware of the fact this could happen, As domainers we all know that deals don't always go through, that's why when I make a domain sale, I don't spend my money before I receive it, at least NOT until the mail man delivers my Escrow.com check.
What I gather from your posts in that you want accountability which is understandable, So my next question is; Why is it taking this long for the forum to ban him?