I have a Nikon D3100 and I love it. The only downside is that there is no auto focus motor in the camera, so all the lenses I buy have ton have the motors on them to use auto focus. I can go into more detail later when I'm back home.
Edit:
Alright. Next question will probably be "Nikon or Canon?" my experience is solely with Nikon. Either manufacturer will be a solid choice in my opinion. Just do a lot of comparing in your price range and go play with them at Best Buy or something like that.
And my question to you is price range? And what are your goals with the camera?
If I had asked around before buying mine, I would've saved for something full frame from the get go. Sure the learning curve is higher starting from scratch, but I feel like the investment would've been well worth it for me. Someone who just does casual photography and uses it only occasionally probably won't be able to justify the increased cost for full frame.