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With the latest Intel i5 and i7 chips, you can now get an affordable home PC that can do some serious video rendering.
Check out this great article on videomaker.com for a detailed write up on what makes a great video rendering machine.
http://www.videomaker.com/article/15264-recommendations-for-the-best-video-editing-computer
Also, if you are looking for portable video rendering machines this is a great write-up on the current laptops on the market as of late 2013. http://www.extremetech.com/computing/167156-the-best-laptops-for-video-editing