sk8ting said:
Hold on, let me cut off my arms and legs to get those lenses.
If you get a d lens - you won't have autofocus. The 50mm 1.8g is about 200.00 and is a phenomenal lens from what ive heard. I've also heard it is better then the more expensive 50 1.4g.
You can go higher then ISO 800 without a lot of noise.
This picture was shot at ISO 3200. Printed out at 8x10 you can't see any noise. Granted it wasn't an area as dark as yours but...it's just to show you that the d5100 can handle high ISO's. I think the d7000 an the d5100 have similar ISO performance.