I just checked your prices. The lowest ($396. and change ) are $15 above current mtgox, with some vendors asking over 450 USD per btc.
Ouch.
I haven't listed my coins for sale yet, but if I do, I would ask way over MtGox price. I don't care if I sell them or not. If nobody will pay my price, I'll just keep them. They're going to go to the moon, you know. Maybe not this time. Maybe not easily. But they will.
I'd say, if you have money invested in Bitcoin from back somewhere, and you haven't gotten your principal out yet, that's what I would aim for... breaking even. Then keep the rest to see what will happen.