I think you are asking for trouble if your TV overhangs your stand, especially if there's the slightest chance someone or something could bump into it. Also, I personally think it makes the whole unit look unbalanced, out of proportion, and aesthetically unpleasing. Then again, that's just my perfectionist personality coming out. You need to do what's best in your situation.
However, when I ordered my new Samsung, I bought the stand ahead of time to ensure that the width of the TV would be less than the width of the stand so that all of the planets would align and everything would be right with the world.
Vermifuge, your setup doesn't look too bad except for those awful wires. Some black nylon zip ties would work wonders.