I will be using the headphones on the bus for maybe 30 minutes a day. After that, I will be sitting down either in my room or in the library and will be watching either lecture videos, occasionally movies, and a good bit of music. On the bus I will be plugged into my iPod. Everywhere else will be on my laptop.
If need be, I can use my SG3's headphones for the bus and the proper headphones for my laptop everywhere else. But I will be spending considerable amount more time with my laptop than with my iPod.