I'm there too, but I have a Celeron to tide me over so I'm not too worried--I'll cancel if the going price goes below the backorder price (339).
I cancelled (or I hope so) my P5W from them since they had no ETA (and emailed them to ask)--got it from the egg in 3 days. Says a lot for neweggs...
I went this same route after getting fed up loading up every site I could find to see if they had at least one of these two in stock. I figure at least I have the price locked in, no need to worry about the fluctuations anymore. I found a couple sites that claimed they had the board in stock...