I'd like to get my first pair of decent headphones, but as a relatively poor person my budget isn't that much. Everyone on the planet seems to think the best value for the money is the SR60s or 80s. I'm worried about sound leakage, though, as well as ambient outside sound. Most of my listening will be walking to work, which is in the Tokyo area, not one of the quieter places in the world. Some of my listening will be on trains, where I might disturb people. I don't listen to loud irritating music -- mostly jazz. But any music will be irritating to others if it's too much. Now I'm starting to think, though, that the Sony MDR 7506s may be the way to go, since they're fully closed circumaurals in the same ballpark price range. So are the Sonys the way to go? How bad is the leakage with the Grados?