Which sub would you choose?

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.

My first thought on the subs you last mentioned, is "great for music potentially, but no grunt for HT!" Everyone's experience here may be different, but I think the woofers you're considering will be more designed with music as a priority in mind. Smaller rooms might do better with more delicate music subs with higher Q factor with HT. But Slamm, impact, and authority might suffer in more agressive and ambitious HT and music set ups! I guess it depends on your needs and applicaitons.
For me, I like subs that can GROWL for HT, and still remain tight and musical. The more expensive Revel B15, M&K MX series subs(depending on room size), Paradigm Servo 15(baragin for HT and music at $1600 new!), And the single standing Infinity Prelude MTS subs with Paramtric EQ (like Revel B15), are dynamight audiphile grade subs overall! For affordable, fast, musical sounding subs for all medium, I think the Servo 15 and NHT Sub 2 are hard to beat for the money!
Good luck