Ethernet Cables - what are you using and why?

Curious about what everyone is doing for their streaming systems in terms of Ethernet cables. I know some people who swear by expensive models, but anecdotally it seems that folks care a lot less about Ethernet than they do about interconnects, AC, or even USB cables. 

I'm a believer but at the moment run a relatively affordable model that I might be looking to upgrade. Let's hear your thoughts.