New year, new computer? Why not? During our January Tech Deals promotion, you can get a powerful Lenovo ThinkCentre M900 for just under half off through January 21. This 2015 model is Grade A refurbished, meaning it has been returned to the factory and fixed up to work like new. The tiny PC runs on a 6th Generation Intel® Core™ i Series 2.2GHz processor with an optional PCIe SSD and 16GB of RAM that make it 128% more powerful than the previous generation. It comes with Windows 10 Pro and a 256GB SSD that gives you more than enough space for all of your important files in an ultra-small, portab…