Bad Render. Too much Noise. Low Light I've been using blender for quite sometime. But I have most my "Disabilities" in the NODE/Material/Lighting area.

I tried most REDUCE NOISE tutorials, tried TOP X Tricks to take out fireflies, but it seems that each case is a case and I cannot achieve approximate results to other people in the same sample size. For example, a person achieves a perfect render a 50 samples. I would have to put 500 samples to try achieve the same result... It's very frustrating.

The lighting inside the "DEN" seems too low, compared to the outside light intensity.

I have a Intel 2600K Processor, G.Skill.Sniper.8GB.1600Mhz RAM, GTX970 G1.Gigabyte Graphics card.

Blender File: http://www.mediafire.com/download/8gd70c8aonbr4ss/BEAR-Radio.blend
(might be missing one or two texture images for the Radio. Just delete that material and it should assume another Radio Material)
For scenes where the light bounces around a lot (think indoor scenes) you're going to need more samples.  Renders that look good at only 50 samples are probably more open than yours.  

That being said, setting max bounces to 0 will get rid of your fireflies, but you will also lose all of the nice bounce lighting.  And at that point you might as well use the blender internal.  My advice is to turn up your samples and go get a cup of coffee.  I wouldn't worry about it.