Was at bestbuy today and the guy told me that they only had one out of 10 different all in ones, that actually let you output to a tv or monitor via HDMI, and all the others were input only! WTF! Why would companies do this?
Better to browse online than at Best Buy. The only thing you're really missing out on is a close inspection of the looks/build quality and the responsiveness of the touchscreen (if applicable). For those, you can compare a similar model in stores. Shopping online will give you more models to choose from, and probably more configuration options.
Don't trust the smiling penguin! http://backloggery.com/mydogskip93