As far as "ethernet" cables are concern Cat. 6e is the most recent "usable" choice.
True , Cat 7 , with it`s 40 GB speed maybe better , but who has 40 GB internet.
I do believe that although commercially available , Cat 7 is over kill.
Cat 5 will still work fine , if you want future prof , go Cat 6.
Cat 6 will be fine for any commercial speed for years to come.
I have changed from Cat 5 to Cat 6 , I don`t plan on buy more Cat cables , well maybe one more Cat 6 , I still have an open port on my router !!