Which sub would you choose?

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

Thanks for the feedback. I would love to here from someone who has actually heard the Mimos. I think I will take my time and look at everything I can at the CES show in Jan. Rivecitylad

check out the Piega speaker system featured in this months Home Theater Mag. The woofer is 3095.00. I'm replacing a Revel System on Saturday sub and all.

I'm not sure how much money you wanted to spend, but check out the Vandersteen V2W sub in a dealer demo. It's what I've got in my 5.1 home theater and I love it! Sells for $1200 new. It actually received 5 stars in practically every category in Widescreen Review Magazine subwoofer review issues last year. One of the only subs that scored higher was the Revel B15, which is an awesome sub but much higher in price. Good luck to you.