Best multi-purpose subwoofer


Best multi-purpose subwoofer - meaning it fulfills my pursuit for audiophile 2 channel listening and my home theater needs. I have a large TV room 22x22x8 (LxDxH) with floor standing Von Schweikerts VR4 speakers. Room is used both for dedicated 2 channel listening as well as home theater. Unfortunately the design of the room is not the best as it has glass on one side (leading to the backyard) and laundry room behind (meaning its also the family room). Currently I have a 8 inch NHT SW1 old subwoofer which needs an upgrade. The maximum dimensions I can afford on a subwoofer is  15x18x20 (LxDxH). 
As mentioned I want to be able to connect a High Level Input (for 2 channel) and .LFE for HT - so the subwoofer will need to have both. Grace for dedicated listening as well as power for HT. The only time I would consider a larger subwoofer is if it has wireless capabilities so I can place it anywhere in the room. 
Any suggestions on which subwoofer may work best for me? 
128x128ghulamr
Swarm or maybe buy a few parts express subs and do sim to swarm. Or just build a proper sub bass horn and be done for life.
I am really enjoying my f112 sub. Dialed in for both 2 channel and HT the unit sounds amazing. Really solid state of the art subwoofer. 

Question is - does using good quality power cable, RCA cable and XLR cable connecting to the subwoofer make a difference? I really don't want to break my bank and tick off my wife - so looking for budget yet good quality cables - maybe used? Currently using whatever I had lying around my house, cheap Monoprice stuff.
guhlamr,

     I doubt anyone would notice a difference between a hi-end and Monoprice xlr cable on a sub.  I suggest saving your dough and making your wife happy, or at least less ticked-off.

Tim
Thx for the thread, pals. I'm trying to choose a subwoofer for $500 max from this list. What do you think about it? Thx in advance
Frank