I listen to mostly rock with a little bit of rap and electronic. For the most part I'm looking for clear/crisp bass. This is especially true of the rock, as i would like to feel individual drum beats instead of just a muffled drone (if that makes any sense). Ground-shaking power would be nice but not necessary. My friend has a powerful system and its nice to listen to in all its glory, but it gets annoying after a while (then again, this may just be because the system isn't properly tuned/balanced). Keep in mind that my speakers aren't amplified, so I don't want my sub to overpower them. Having said that, I have heard that IB systems aren't necessarily known for having crisp bass... I'm thinking of just going with a traditional setup with a ported box, as I guess it wouldn't be that hard to just take the box out and leave the amp in when i need the space. I'm also thinking that it would be a good idea to take the sub out when I'm transporting the bike to make sure that when things shift around a pedal doesn't go through the cone. I'll probably stick my bike in my trunk and take some pics tonight so you guys have a better idea of the space i'm dealing with.