I have a D3100 that I’ve been using since August 2011. I suggest
getting a set if “close-up” filters that screw on the front of the
lens. This gives you more flexibility for shooting different size
objects, e.g., rings to cuff bracelets. About $50.
I use one of the wireless SD chips called Eye-fi. I LOVE it. So easy.
So convenient. Thought it would be a gadget (I love them too). But it
really streamlined the whole downloading process.