Oh man, you should get it just to resell! lol
Which advanced features on 7D vs 1D? Video is one, for sure, but I think the T2i with ML beats the 7D for video, handily, and we both have one of those.
Another consideration is that the 1D3 was still $4500 when the 7D was announced for $1700. Right now, you can buy them w/in $200 of each other on the used market.
I am not really familiar with 1d accept that i think they are old but a flagship of canon, they are really going down (used) average I've seen is 1200 so far. I think the bigger sensor they have is the more sharper I think. Did not really research that much with 1d mark III accept that I keep reading it has tremendous image quality. I got so excited in 7d so much so did not pay attention with 1d 1 thing I am afraid is breaking down on me. Perhaps I should have not kept this to myself a week ago in the thread, maybe now I am enjoying the 1d he he he.