I'll be honest, the idea DOES intrigue me, but if I were to do that I'd go right for the big 18" one and not look back. I think you'd be able to setup a pretty good looking unit there for just over $1000 and you can't find a decent 18" sub for that price.
Dayton Audio 18" Ultimax Subwoofer and Cabinet Bundle 1,000 WattsDayton Audio 18" Ultimax Subwoofer and Cabinet Bundle 1,000 WattsBuild the ultimate subwoofer capable of moving over six liters of air with each stroke! Truly not for the faint of heart! CNC-machined subwoofer cabinet and the...
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My only concern is just HOW good it is across the board...does it just THUMP real big, or is it smooth and controlled when you need it to be? That's where I'd be most concerned about dropping that $1000+...but I'd still be willing to look into it more for sure.
In Canada, I just can't get easy access to this stuff.