I had been one of those waiting for a high-end HTC android device on AT&T too. When I heard about the Inspire, I was all set. Until I learned more about the specs, that is...don't get me wrong, it's a nice phone too, and I actually prefer HTC's hardware aesthetically over any other manufacturer's hardware - it's just, compare the specs man. Atrix's specs compared to Inspire's. It wins without even looking at the accessory side of things yet. The Inspire is nice but, for me personally, it has some pretty huge disadvantages, particularly that whole battery thing being tiny as hell and non-upgradeable to a larger one. Compare that to the Atrix's 1930mAh one and I may not even ever need a 2nd battery to begin with, especially if I don't get the laptop dock, which I'm leaning towards not getting. I wish the screen were super AMOLED or super AMOLED +, but I can live with the qHD screen. The Inspire's is .3 inches larger, which is great & all, but I actually prefer the 4" to the 4.3" phones. Looks-wise, 4.3" is cool as all get out, but for practical use, I find myself personally favoring the 4" when I hold them in the stores. Navigating around with one hand is easier for me.
Anyway, I'm sure there's a whole lot more that could be said for either phone. They're both great phones, but I'm hoping that the Atrix's specs will keep it still slightly relevant for awhile, while the Inspire's specs are already..well, not outdated or anything, but, they're lower than the Atrix for sure.