I'll actually update that thread. Apologies for the derail eddie13.
I just read that thread and was all "DAMN I want that!!"
No problm at all..
That specific coin went for less than it should have done, I would say. It was rather the exception, than the norm.
You say that you want a Casascius 0.5BTC Coin. Is this because of budget, or are you specifically after a Brass Half? If your budget is low, then going for a brass half might be a good idea. If your budget is higher, you can get more bang for your buck.
If you can afford a bit more, I know of some Casascius 2013 Brass 1BTC coins going for less than 1.3BTC each..
if you are after premium coins, there are also some ANACS Graded Casascius Silver 0.5BTC Coins floating around ( not on the forum, but can be arranged ). They demand a much higher premium than the brass, and are therefore more expensive.
Is this something you would be interested in? Let me know if you want a picture of an example of one of the Silver 0.5's from Casascius.
Edit: I see that you currently have 0.811 to spend. Hmmm.
Does the coin have to be a Casascius? 0.811 is not going to be enough to pick up a slabbed brass half. You will need a bit more BTC.