That speaker looks like it was intended for sound reinforcement, not really for home use. Although the

For computer speakers I've heard lots of good things about Audioengine, but most computer speakers are total crap. Bass is nice but it's not the most important thing. Midrange where vocals, guitars, and most instruments reside is of the utmost importance. Gordon Holt (the founder of Stereophile) once said that if the midrange isn't right nothing else matters. I haven't heard those skullcrushers but I'd bet they are a one trick pony, reproducing lots of bass and little else. I looked at head-fi.org and not a single mention of skullcrushers. head-fi is probably the single best source of headphone information in existence. I know that you said that you listen to techno but I wouldn't recommend it for evaluation headphones, or audio in general. There is a very simple reason for this stance. How do you know what it was supposed to sound like? When choosing audio equipment you should choose the equipment that is most accurate (when you close your eyes which most makes you feel like there are musicians in the room with you) not which one "sounds best." In your life you've most likely heard a real piano, acoustic guitar, maybe a violin. If you choose the product that duplicates those most accurately you can be confident that you are hearing exactly what artists using non-acoustic instruments wanted you to hear. Also beware of headphones that sound like they have lots and lots of detail right when you put them on. That usually means that they have too much high frequency information. This may be nice for the first 20 minutes to an untrained ear, but soon listener fatigue will set in. Again remember to ask the question, which one of these headphones most make it sound like I am in the same room as real musicians and it'll be heard to go wrong.

Three of the most highly regarded headphone manufacturers are Grado, Sennheiser, and AKG. I prefer the Grado products. They tend to be a bit smoother and sweeter, than the Sennheisers. Which leads to the ability to listen longer. They also are easier to run, giving better battery life on portable devices. I've never listened to any of the AKG stuff so I can't comment on those.