Between "Breaking Bad", "Mad Men", "The Killing", "Walking Dead" and "Hell on Wheels" -- if I could JUST buy AMC for cable, I probably would.
I used to love HBO, but they've been stagnant lately (in my opinion.) "Luck" is already cancelled. Though I had high hopes for it being the harbinger of HBO's return, I think the last great show they produced was "Carnivale".
Thanks for bringing up iTunes, as I've been having a hard time catching up on AMC shows I missed, and didn't know they had the inventory anywhere.