I've been doing some research on subs, and I've noticed that subs are so different. I know that weight and speakers go hand in hand, more weight = better generally. So is an 80 sub better than a 40 sub. What's the benefits of front firing, and down firing subs or cylinder subs. Has anyone build their own, how did it sound, and do you have pics. Here's a few I'm looking at.

Axiom EP350 39lbs. - $620
SVS PB1-ISD 78lbs. - $599
JBM PB12 40lbs. - $479
Cambridge SoundWorks P200 30lbs. - $599
SVS 25-31PC-Plus $775 not sure about weight.