what is the best and stable internal hard drive to buy for new pc?

Hi movielover,

One of the best and most stable internal HDD drives you can currently get is the 2TB Western Digital Black. It should last you for many many years. Here is a link below:

Amazon: http://www.amazon.com/Black-Performance-Desktop-Hard-Drive/dp/B00FJRS628
Newegg: http://www.newegg.com/Product/Product.aspx?Item=N82E16822236624

Depending on your needs you can select other hard drive sizes for this drive, but WD Black is going to be one of the most reliable hard drive lines you can choose.

 
The Caviar drive line was an older line of drives.

Here is an easy to read chart from Western Digital's Website on their current drive line:

http://www.wdc.com/en/products/internal/desktop/

I'd go with the most recent version if you can, like the one I linked in my first post.