Best Nikon camera for low light?

I photograph bands playing in my hometown for the local newspaper, and currently I tend to borrow my dad's Nikon D7000 for shoots. I myself own a Nikon D3100, which in low light doesn't work well at all. I'm planning to save up for a new camera, but I wasn't sure which one would work well for the lack of light, any suggestions? Don't worry about price, I'll look through them all and see which one would work well for me, thank you for your help in advance!

None.

Technically, it's all in the settings. Ideally, for low light, you'll need more ISO. More ISO though will make the picture more noisy or grainy. It would help a lot if you used a fast lens. The lower the f/number, the better.

Honestly? The better the digital sensor, the better performance in low light. To be sure, get a full-frame camera. The expletively expensive one.

Well… If you look at the DXO sensor ratings in the link you'll see what's going on.
http://www.dxomark.com/...17_664_680

Remove the Sony A7R 35mm camera from the slection (it blows everything else away) and tick the Nikon D3300 and you might start to see the way you need to go.

Also if you use a 50mm f 1.8 lens and learn to frame for that, you will get better low light results.

In the Nikon line-up, I think D4 and Df are the best low light performers, followed by D3S, D800 and D610.

Before you replace your camera, upgrade your lens.

Even if you spend $4K, at best you will probably get 1 stop improvement in low light performance. But even a $600 lens can give you a 2 stop or more improvement.

For example, a Sigma 17-50mm f/2.8 will give you a 2 stop improvement at 50mm over your 18-55mm kit lens. This lens currently sells for around $560, so it is a very cost-effective solution.

Or if you want, the Sigma 18-35mm f/1.8 zoom will give you a 3 1/3rd stop improvement, but at $900 it tends to get pricey.

Or consider a prime lens, such as the Nikon AF-S 50mm f/1.8G. It sells in the $200 range, and also gives you a 3 1/3rd stop improvement at 50mm over your kit lens.

You could spend $100k on a camera and not get a 3 stop improvement.

The lenses make more difference than the camera. Don't buy a new camera until you have upgraded your lenses as it is much more cost effective.