Don't mess with ANY consumer level subs... even if the DJs don't overdrive them to a certain death, which they will, the cabinets wont hold up well to the abuse of a club application.

You need big cabs with industrial finishes, speakon positive locking speaker terminals and sturdy metal grilles.
James, Boston, etc. are nice home subs for a living room, but they will live a short, tortured life ion a club application.

Cheaper end products to look at would be Peavey Black Widow, Ramsa, MTX, Yorkville, etc., and the very top end are the BagEnd, Meyer, and ServoDrive models.

The middle ground is populated with a lot of choices, look at JBL, EV, Community, Cerwin-Vega, etc. and buy a lot of good clean power to drive the cabinets. Also, use an electronic crossover, don't rely on the worthless coil that is in there to actually keep the bass from being boomy and crappy sounding.