If you have a look at my resources, I have uploaded quite a few reading comprehensions for higher-ability students based on authentic news articles. I hope they are of use to you.
I use the following sites:
www.metro.co.uk (shorter articles, serious topics, language is not too difficult)
www.cbbc.co.uk/newsround (short articles, child-friendly topics)
www.theguardian.com (longer articles, more complex language, serious topics)
www.bbc.co.uk/news (longer articles, serious topics, slightly simpler than The Guardian)
www.bbc.com/news/blogs/news_from_elsewhere (shorter articles, funny topics, quite complex language)
www.washingtonpost.com (American English, longer articles, complex language, serious topics)
www.dailymail.co.uk (shorter articles with LOTS of pictures, quite simple language)