joscow, read up on the subject, you will find the benefit of using 3 or 4 subs so outweighs the choice of sub that four dirt cheap subs will be much more cost-effective/high performance than the same amount spent on any single sub - no matter how much "better" it is.
Cost Effective Sub Woofer
Interested in obtaining a cost effective sub woofer for a reasonably good sounding two (2) channel stereo system consisting of the following equipment: Monitor Audio Gold 100 speakers on monitor Audio stands, Rotel Integrated amp, Linn Basik turntable with Rega Exacta 2 Cartridge, Kimber Speaker Cables and jumpers, Interconnects and digital cable, Marantz 5004 CD player, PS audio Power Cords. The music room is not treated and 17 x 24 in size. Any suggestion on a sub woofer. Prefer to stay under $1000.00. Listening preference is jazz at moderate volume. Not loud at all.