Which sub would you choose?

How about the Aerial? Best sub I've ever heard. $10K for a $700 woofer in a big box? No way.

I have a wilson sub in my listening room right now sitting next to a velodyne 18, I will tell you that I think the velodyne is better regardless of price, and I will be taking the wilson back to the store. I have to say also that I am a wilson puppy 6 owner and love them set up with atma-sphere mp1 pre and ma2 amp. I have not heard a system that I like better. I am also very sure there is a better system in many a home.

So now, just for curriosity's sake "Rivercitylad", I would like to know if you STILL plan on buying a Watchdog woofer? Also, has any of what has been said above caused you to possibly rethink your choices?...currious.
Really, a good woofer(or more..even better) properly set up, with good seating location, and with possible parametric EQ'ing, and you would be shocked at what's possible! Even modestly good subwoofers, properly set up and calibrated will do some very good things sonically.
Have fun...

Thanks for the insight in sub selection. I think I will rule out getting a single sub and focus on which pair to buy. I think my choice will be between the REL Stenor , the Aerial SW12 and the Audio Physic Mimos. Anybody have and feedback on these three? Thanks, Rivercitylad

All three of those are very good. I have not heard the Stenor, but have heard enough of the other REL models that I can imagine what they would sound like. It really comes down to system matching at this point, and that is not very easy with subwoofers. I have not heard your speakers with any subwoofers, so I don't think I can offer very much here. Perhaps someone with your speakers can speak on their experience with subwoofer integration.