I'm looking for suggestions for a pair of headphones that won't leak sound. They're for when, say, the missus and I are both on the sofa, she wants to watch TV and I want to listen to some music. I have a pair of Grados that I sometimes use with my main hifi system (in another room) but they leak too much sound. Serious listening is not the criteria, these headphones are going to be used with a Marantz M-CR610 streamer / CD player, and while I want decent sound quality no sound leakage is the primary criteria. Headphones are not my strong point so all help appreciated. I'm setting a budget of around £50 but if that's too low then I can go to £50 - £100.