Isn't the 5100 just an upgraded version of the D5000? Were the differences that impressive that you felt you needed to upgrade?
There are quite a few signifigant differences betweeen the D5100 and the D5000.
The same is true for the D3000 and D3100
Here are some highlights:
Significantly lower noise at high ISO 1,183 ISO vs 868 ISO
The D5100 has a slight edge (0.4 f-stops) in low noise, high ISO performance
More than 10% larger screen 3.0" vs 2.7"
Significantly higher resolution screen 920k dots vs 230k dots
4x higher resolution screen Higher resolution movies 1080p @ 30fps vs 720p @ 24fps
Shoots higher resolution Full HD (1080p) video at a higher frame rate Better image quality 80.0 vs 72.0
Continuous video focus Yes vs No
Significantly better color depth 23.5 bits vs 22.7 bits
Distinguishes more than 70% more colors
Has in-camera HDR Yes vs No
Has an external mic jack Yes vs No
Record high quality audio with an external microphone More dynamic range 13.6 EV vs 12.5 EV
1.1 f-stops more dynamic range Better boost ISO 25,600 ISO vs 6,400 ISO
The D5100's boost ISO is 2 f-stops better Significantly higher true resolution 16.1 MP vs 12.2 MP
Capture more than 30% more detail in your photos
Longer battery life 660 shots vs 510 shots Around 30% more shots per battery charge
Better maximum light sensitivity 6,400 ISO vs 3,200 ISO
The D5100's maximum light sensitivity is 1 f-stop better Smaller 127x96x78 mm vs 127x104x80 mm
Around 10% smaller Slightly lighter 560 g vs 590 g
Disneygirl, enjoy your new toy
