Sony MDR-210LP Open-air Headphones

A house member got these a while back for general use (listening to stuff on iTunes etc.) but I sometimes use them because they are very comfortable. They are very light and you can barely tell they are there, so I find them good for gaming and prolonged computer use. There is quite a bit of bass although some of the high frequencies can be drowned out. I have not tried these in public spaces so I can't comment on isolation etc.
 
Overall however for $20 or less these are very good value imo.