The screen on the 320 is ok. It's not like the iPhone by any means, but it works. The picture review is pretty cool with the touch screen as you can either swipe or tap the side of the camera to go next one. I would rather have the buttons for precision, but I like some of the things the touch screen allows you to do. It also has wifi connectivity to the Internet and computer.
It will hold many different Scandisk Memory cards.
You can go to the online manual at Canon.
I would get one of the more exspensive cards with super fast write speeds. I did and it works awesome!
I guess it is just a sale. I started my shopping process at Best Buy and noticed that the other cameras with the wifi feature were 160+ and I didn't really need that (I can deal with putting the little card in my laptop). I was all set to buy another camera but they couldn't find it in the store and getting one from a store that had several in stock was a major ordeal that was going to take an hour. I gave up and left. If they don't want to sell me a camera, too bad for them. I looked on Amazon and saw this and saw the great price (only $15 more than the more basic one I was going to buy) and snapped it up. I also got the leather case as an add on. It protects the camera well.