The "main" model is the 2.2 ghz Core i7 (2720QM), with 750 GB hard drive spinning at 5400rpm, and 4 gigabytes of RAM. All stores that are stocked, are stocking that. I checked the two near me, and they both have them. Anything else is BTO, and aren't available at retail stores (theoretically! see below...). The apple store I visited in person yesterday said that on a normal day, they _would_ install ram upgrades at time of purchase, but that does involve some genius bar action. He said they couldn't do it yesterday because they hadn't yet received the RAM modules.
However, I would like the 2.3 ghz model, and none of the stores around here seem to have it, despite the fact that there are dozens of results uploaded to Geekbench, and plenty of people in the forums here claiming to have purchased them from their local retail stores.
One of those two stores near me is the flagship Boston store, as well. I was kinda hoping they might have it. I don't care so much about the HD and RAM (which I can upgrade later) but I would like to shoot as high as I can with the CPU.