Nick:

An excellent point about the choice of subs constantly coming on stream. Some of these companies designs are also integrated into other companies products. For eg., Outlaw Audio's LFM-1 Plus and LFM-EX subs are slightly altered HSU subs but with basically the same amplification, inputs and outputs with even the manuals virtually identical to one another.

Surprisingly though, the Outlaw subs are significantly less money than the comparable HSU models and are surprisingly, more pleasing to the eye in external design and certainly no slouch in comparable performance.

It seems, nowadays, that unless the company in question is touting domestic manufacture, which, will probably make the price significantly higher as opposed to those companies who tout domestic design but with offshore manufacturing which then makes it considerably less costly, the performance capabilities, in either case, from what I have heard, are usually quite comparable.

The choices are certainly astounding and you don't have to break the bank to get top performance.