I have a Linovo K450e computer with Intel i5 4460 cpu and a 280W PSU!!! I want to get a NVIDIA GeForce GTX 960 graphics card though. So, I decided to change PSU and, through a lot of research, came down to those three.
Edit 2:
http://www.newegg.com/Product/Product.aspx?Item=N82E16817438049&cm_re=220-GS-0550-V1-_-17-438-049-_-Product
http://www.newegg.com/Product/Product.aspx?Item=N82E16817438014
http://www.newegg.com/Product/Product.aspx?Item=N82E16817438012&cm_re=100-B1-0500-KR-_-17-438-012-_-Product
Edit 2:
http://www.newegg.com/Product/Product.aspx?Item=N82E16817438049&cm_re=220-GS-0550-V1-_-17-438-049-_-Product
http://www.newegg.com/Product/Product.aspx?Item=N82E16817438014
http://www.newegg.com/Product/Product.aspx?Item=N82E16817438012&cm_re=100-B1-0500-KR-_-17-438-012-_-Product