Personally I would stay away from the Sennheiser's and the Audio Technica.
The Panasonics are a good choice but they aren't too portable. I don't know if that's an issue or not. They also need a few mods to truly shine (nothing too complicated). Keep in mind though, they're definitely a bass-heavy phone.
I couldn't give you any advice on the Superlux, but I've heard very good things about them.
concerning the iGrados. I know you've already stated your...