I'm curious to know what news site we all go to and what brings you back to it? Is it purely content? UI? What deters you from a particular site?
The video content on The Verge is top notch. The design and relevance of Designer News is great. Reddit is chalk full of great content.
Bottom line, content first.
Designer News (of course), Hacker News, followed by Mashable, and TheNextWeb. Purely content.