Suggest a Camera for around £500

[teulk]

I'm looking at buying a camera for my wife, she currently has a Nikon D3000 - looking to spend around £500. She does a bit of "urban exploration" so perhaps a low light lens might be useful ? and perhaps a zoom lens up to 200 - 300mm. I understand £500 may not be a great amount to spend but any help would be appreciated.
Thanks

 

[teulk]

What lenses does she have at the moment?

Nikkor 18-55mm ( nikon DX ), also has VR on the lens

You will have to excuse me as this really means anything to me.

My wife had a Sony A200 ( that broke ) before her Nikon, she had a sigma 55-300mm lens with that. She often mentions that she wishes she had a similar lens. I know it would be cheaper to keep her current camera and just buy a lens but i would like to get her a better camera and lens if possible for £500.

 

[teulk]

I also don't think Sigma make a 55-300.

Your right, i misread what was on the lens - meant 75-300mm.

Thanks for the advice