Hi Ricks your going to struggle to get a good low light setup for that money.
Seconded.
I recently sold my Nikon D90 and D300 (amazing camera) and bought a D7200, purely for the low light. I would happily have carried on using the D300 if it could work well at indoors events and under tree cover on cloudy days; arguably you can adapt your technique and take different shots, but at the end of the day I also use it for work and need things to be pin sharp.
From my limited perspective (I’m not a camera techophile and only really shoot sports) the main gain over the past five years has been low light / high ISO – the difference between what the D7200 and the D300 can take is incredible, even if in regular conditions the D300 is actually a nicer camera to use.
The 3100 above is certainly worth a look IMHO.
