Looks like Arai have introduced some new models into the range for 2013 including a couple which look like they're designed to fit longer, narrower heads like mine. This makes me very happy as I've been struggling to get a lid to fit for the last couple of years. It didn't used to be a problem. Pick up a Viper GT et wallah......comfy noggin. I was hacked off that they discontinued the model but it looks like they might've decided to help us rugby ball-bonced unfortunates Haven't tried one on yet but it's looking the new Quantum ST or Rebel could be the charm.
I've always like Arai's just that little bit more than Shoei's, however I have a 'Shoei' head and that's what matters most, fitment.