Currently, the 2 best Bitcoin mining Manufacturers are:
https://www.bitmaintech.com/product.htmand
http://www.spondoolies-tech.com/If you're going hardware, these are the only 2 reliable and trustworthy companies to consider.
As for models, the best bang for the buck is either the Bitmain Antminer S5 or Spondoolies Tech SP20.
Great for hobby and home mining. ROI, that's a whole other story though...