Which one of these desktops should I get for casual gaming?

Since Sims 3 isn't a really demanding game then most computers will be fine with it, anything with about 1GB ram and a graphics card from at least 2005 will work fine, my computer worked with it fine however mine has been made for gaming. XP or Vista will play it fine and i think possibly windows 7 will. I wouldn't worry if it doesn't because when i got a game that didn't work for my old computer i sent it back said it didn't work because my computer couldn't handle it and they gave me my money back (it was from amazon) but yeah, it should even work on some laptops. So the answer to your question is most desktops should play it.