Okay, I guess they are VERY open. Although, I don't want a completely closed headphone. I am looking into semi-open headphones. Possibly the KOSS PortaPro's.The Grado's aren't exactly your best bet for portability. Wind noise will be terrible, and isolation is near nonexistant. For portable headphones, a pair of IEM's or closed-back headphones would probably be better.
In my experience, the SR80 does offer improvement over the SR60. However, pads themselves almost made a larger difference, and any mods you perform can boost the SR60 up past the SR125 (especially if you can make/buy new cups).