Nikon D3100, D5000 or D5100?- Begginer DSLR camera?

The new Nikon D5100 is an update to the existing Nikon D5000 line which was introduced in 2009 as an “upper-entry-level DSLR”. Sitting above the Nikon D3100 camera, the Nikon D5100 comes with more features and a better sensor technology to attract current entry-level DSLR owners that want to upgrade and potential customers that want to invest in a more advanced DSLR. Both DSLRs have the new Expeed II processor from Nikon, which allows faster image and video processing up to 1080p (the previous Expeed processor could not handle more than 720p video).