I'm looking to buy a used Win 7 Dell Optiplex minitower PC off eBay, and need to know what to look for so I don't get stuck with another PC to send to the recyclers. Mostly it will just be used to explore the net, and watch online movies, TV shows, YouTube videos, etc. The previous PC failed in the latter, as there was loads of stuttering, buffering, freezing, etc. What sort of components do I need to look for to prevent this? CPU? Will integrated graphics be enough, or is a graphics card required? Minimum RAM? I just need to have some parameters to use for shopping. Thanks.