Actually... this is the one I want... DIYCable.com : Intro » Home » Exodus Subwoofers »
Go for whatever will work in the box you're going to put it in and you can actually power, has decent sensitivity, decent power handling (RMS, nothing but), and a decent xmax rating.
The DIY cable speakers might sound a little better because they use XBL^2 motors but they typically end up sounding the same when pushed.
I think he skimps on the spiders IRRC.