Good deal. Congratulations.
The idea behind Valhalla is to get the Arcade to $99 *before* any retail sale discounts.
Don't see that this year, though; $149 is more likely or, *if* MS thinks they can make it up in volume and want to make Nintendo sweat, $129. (They did drop the Pro $80 once).
Pure speculation: I think the 360 will drop in price whatever Natal retails for. (Plus, maybe, an extra $20). With Natal running $50-70.
So that will allow for an Arcade at $129, the Elite at $229, and Natal bundles at $199 & $299 including a game or two. Emphasize that those prices allow for up to four simutaneous Natal gamers and the value proposition will fly.