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A distributed bass array system was one of the best upgrades I've ever made to my system. The complete systems cost about $3,000 and consists of 4 relatively small subs and a 1K watt amp that drives all 4 of the 4 ohm subs.
These bass systems are especially adept at providing state of the art bass to systems with fast and detailed spkrs that are a bit bass shy such as electrostatics and planars.
I have large Magnepan panels that are excellent but somewhat bass shy (good bass output only down to about 37Hz). I bought the Audio Kinesis Debra system for $3K and my system now has excellent bass response down to 20 Hz that integrates very well with my planars running full frequency.
These distributed bass array systems do require some extra space in your room but they blend in well in my 23' x16' room. Here's an Absolute Sound review of the Audio Kinesis Swarm system(which is the same price and very similar to the AK Debra system I own.)