It gets moved to shipping when UPS gets the billing information. They don't necessarily have the laptop yet. You'll probably get your tracking number later on today.
Their communication sucks but as I said, I didn't have any problems getting my memory. The only communication I received was that they received my order.
Not all review sites got 5200 either. Some got 4900 so as long as you are in that range I would think you are alright. And yes, overclocking voids your gpu warranty, even if it is only 1 year.
The Sager is supposed to receive the 6800 Ultra so I would go with it when it gets it. It's not that far behind even without it as they have DDR3 now.
Battery life and weight are the major reasons to go XPS2. If they are not...