NO!! That Dell with all those wires. I like my iMac without all the clutter. I'm sure others do too. I have a couple of backup 2tb HDDs(LaCie) that sit on top of one another and next to it an external DVD Burner strictly for burning backups already.
I use an external DVD Burner(LG) on my imac too. It comes in handy burning backups. The internal burner reads and the external writes. Btw, an external DVD burner will always outperform an internal DVD burner unless it's a desktop PC. AIO PCs are also slow.
I checked and I now see the Twentieth Century Fox movies listed. Still some movies aren't and I guess because some are independents such as documentaries, music concerts and shorts. At least now if the internal HDD fails or the backup crashes at the same time[wonder what the chances are of that happening] I'll be able to download them without having to pay for them again.
Have you ever checked out iTunes Match? If you did, you probably wouldn't have had to ask these questions. I'm sure that iTunes Match isn't any different where it's available from one country to another; just the cost. Here's the link from Canada. I hope it helps. http://www.apple.com/ca/itunes/itunes-match/