What key features should I look for in a new desktop computer?

Question by deaconofreakin: What key features should I look for in a new desktop computer?
I am trying to keep the cost down but I also want a computer that will last for a while. It will mostly be used casually as I will not play games on it but I am hoping to use it for a small business and it may become my bedroom tv as well.
I am looking to spend around $ 1000. Should I look for DDR3? Should I find a processor that is faster than 2.6 Ghz?

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