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If you need auto-focus and auto-exposure and want to stick with the current range of Pentax lenses, the DA* 50-135mm f/2.8 zoom is excellent and fast. I am not sure whether you'd call $700 mid-range. Also I couldn't say if would be long enough for your applications.
The DA 55-300mm f/4-5.8 gives you twice the range at half the price, at the cost of one to two stops less light.
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