Hi Tony,
I upgraded from 40D to 1D3 a month back and never look back. I have the 40D and 1D3 with me side-by-side and I was wondering if I should sell my 40D off. The 1D3 focuses so much faster, and I just love the muscular built. IQ wise, I would say it is obviously cleaner than my 40D even though both are 10MP bodies. Like you I had considered the 7D too but it does not have better IQ than even my 40D. High ISO looks terrible on the 7D, on the sample body at Vivocity with my own 24-70L.
The 1D3 can only go as high as 6400 (H) but it still looks cleaner than the 7D. 7D is new, packed with cute little features but IQ is a bit lacking especially when you crank up the ISO. 1D3 on the other hand, is one solid block of metal and delivers clean images up to ISO 3200. Hope that helps in making your own decision.