i purchased a nikon d80 digital camera on ebay i was told it was a usa camera, im not sure it is and would like to find out to make sure it is not an import camera due to warrenty issues, if this camera is a import camera nikon usa will not perform service on [...]

Hello,
At work I use a Nikon D80 camera with a 18-70mm Nikkor lens. Most photos are of people touring through the building, which is low lit. I prefer to use no flash, and on shutter priority, with a speed of 1/125 of a second, and an ISO of at least 1600 or greater.
The [...]

Over what other cameras?
I'm sure I can name at least one advantage over ANY camera (doesn't mean it has no disadvantages over many)…
Let's try some examples:
Over Canon A520 — It's an SLR, much better quality
Over Nikon D3 – much-much-much cheaper. Takes DX lenses…
Over Nikon D40 – more dedicated control buttons on body, has small LCD [...]