Subwoofer questions -- music only


I have a wonderful pair of Von Schweikert VR-1 standmount monitors that I currently augment with a single Martin Logan Abyss subwoofer. I'm curious about running a stereo sub configuration.

I'm not a bass freak, although I recognize the need for that octave below 60 Hz or so. I would like to hear what benefits stereo subwoofers might provide. I also don't have an unlimited budget. So . . . can anyone recommend a pair of subs at $1,000 or less that I might compare to my single Abyss? One choice would obviously be another Abyss. Is there something better at that price point? Again, I don't really care about pipe organ music, so a 10" sub would probably suffice, but I do need the ability to come off my amp OR my preamp. Thoughts? Thanks.
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Pulled the trigger on a pair of the XREF 10 subs by Emotiva. They should be here tomorrow. I'll post a review in a few days. Thanks for all the recommendations . . .
Read some of the reviews of Thiel's Smart Sub and S1 Integrator. Really interesting stuff. I found that it's always not as seamless to add a sub without compromising the crossover of your mains so the solution that Thiel offered made perfect sense to me.
You will not hear stereo separation from dual subs but you will have smoother in room response running multiple conventional sub-woofers.