Whether its released in Sept, Oct or Nov you can bet that you won't find the suckers in stock in anything but the $1k extreme version until Nov or Dec timeframe. Same with mobos.
I know your feeling of impatience. Mine was with the original release of Kentsfield (the very first quads in fall of 2006). I had a 2.8GHz P4 Northwood at the time.
I was like a rat pushing the button for his cocaine hit, checking the web 10 times a day to see if Kentsfield was released, and then when that day finally came it was another month to find the sucker in stock. And then it was time to pay the piper and shell out $1500 because there was such a shortage even a month after release that the premium was just that much higher.
Oh and so too was the issue getting an Asus Extreme Striker board at exactly the same time. Paid nearly $500 for that.
I think it was worth it, but then again I had the cash for such crappy price/performance hobbies. I won't ever do it again though, once was enough to get me to kick the habit.
I have every expectation you are in for the same ride as you try and find an i7 chip at any GHz and any price along with seeking out one of the very first x58 mobo's to hit the market.
Be patient, adjust your expectations to assume you aren't getting the system until Dec timeframe and try and enjoy the next 90days of your life doing something other than being addicted to 5min updates on Nehalem release status (I soooo wish I had my 90days back from doing that with Kentsfield).