What should I look for in a mountain bike for under 800?

The question says it all. I am trying to find a good bike to begin mountain trails and such. It will lots of uphill and downhill and some road use. I would like to keep it under 800 with tax if possible. If you can recommend any brands/models/ or even what type of parts I should expect so I do not get swindled at my shop.

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Tags: Bike Trails, Mountain Bike, Mountain Trails