Where to download...?

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What is the best site to legally buy and download movies from? I do not like using iTunes because although it is legal, and very simple and easy to use, its movie selection is not as big as its song collection. So I would like to know which legal sites are recommended for buying movies from. I do not want to pirate them so do not recommend I go the bittorrent or something. I also would like to view it on my iPod Video and iPod touch if possible, so please keep those things in mind when answering. Thanks in advance!