All of those can be good choices depending on your needs, but some of them have some potential drawbacks like the Spec-01.
For example, it doesn't have sound-deadening material, has one USB 2.0 and one USB 3.0 connection on the front, only has mounting for 120mm fans, only comes with one 120mm fan, and the top remains open (no removable covers if not used) like the higher-end cases on the list.
Things like accommodating 140mm fans, included fans, easily removable filters, and sound-deadening material is important to me. So that's why I chose the R5. Plus, I paid $90 for it a year ago, and $70 is a steal in my opinion.