There have been many alt HN interfaces. I try them all, yet I never end up sticking with any of them. I feel like HN meets its needs pretty well and I like that they have resisted change (whether consciously or not)
I think the happy medium is one of the browser extensions. I'm using "Hacker New" for Chrome, and it adds basic nice things like default larger text, comment collapsing. Of course, I get used to it and become annoyed if I decide to visit the unmodified HN on my mobile device.