"I searched and I found interesting the nikon d5100 and the nikon d7000 but it's more than 500 pounds"
Why do these ones interest you? I assume you are looking at the higher entry level cameras as you want to max. out your budget? This is a common theme I find amongst new users to photography, an "arms race" whereby more importance is given to the cost and specs of the body than the lenses. The number of people I meet on my travels carrying round full-frame cameras and D7000 etc who admit in shame that they only ever use the Auto function!!
Go for the D3100. It is very cheap at present due to the various upgraded models ahead of it. You have no need to "start" with a D5100, D7000 or better. The difference to a beginner is negligible. Within your 500 quid have you factored in lenses? You will want more than the kit lens the minute you begin learning more about the subject. These cost more than the body, significantly so, and they dictate the quality of the photo far more than the body will. Pixel count etc. is meaningless at the entry-level.
I researched the subject A LOT when I invested in one (DSLR). I was a newbie, still am! Just a LITTLE bit more knowledgeable than I was when I bought 2 years ago. I went through the whole marathon of learning about cameras, what it all means, learning about taking pics with the new camera etc. To this day I still come across people every day on my global travels who carry round top TOP range DSLR and yet admit they cannot operate the thing, or use it beyond snapping images on auto. Sledgehammer to crack a walnut springs to mind.
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