At the risk of being insulted by wannabe audiophile nerds, I'd recommend the Bose Triport AE 2. Seriously. They're pretty good. Check them out in the store.
They fold flat, have excellent isolation, excellent comfort, and excellent bass extension (I can hear down to about 18Hz at normal volume) and impact. They have improved durability over the Triport AE.
As for the Grado SR60/80, I found them painful to wear for extended periods, the earcups have no stops and therefore swivel freely, twisting the wires which you have to untwist when you wear them since they hit your face. They sound like $80 headphones. Quite a bit better than PortaPros, and slightly worse than the Triport. They have very little soundstage if any at all, which people will politely refer to as being "forward" or in the "first row". Oh, and since they're "open" headphones, people within 5-10 feet of you will be commenting on your choice in music and telling you that you're ruining your hearing.