I admit my first reply wasn't really a reply to your question, it was more of a reply to inform you you didn't need to spend very much money to get a card to do what you need.I checked out the link, but I found it more useful to read a lot of motherboard manuals. It turns out that, after using Neweggs power search to limit the boards to microATX and supporting the ram I need, The Intel G45 chipset pretty much universally supports dual monitors. After reading the manuals for about 10 mobos, they usually will support monitors on the VGA channel as well as the DVI/HDMI channel.
I highly doubt you can run 2 different wallpapers, I don't even think you can do that with nvidia cards... I would be extremely surprised though if you could not run 2 monitors at different resolutions.Does Intel's GMA software allow the display flexibility that ATI or Nvidia's control center would? I love little the gimmicks like different wallpapers for each screen.