One Svs or two Paradigm????

I own a Svs PB13 Ultra subwoofer and deciding whether to try a Paradigm Seismic 110 or two. My carpeted theater room is 19.50 x 14 x 8. My mains are Paradigm Signature S1's, C1 center and adp1's for rears. All my wiring is Synergistic Research Tesla SE series and my sub wires are RCA phase II and a Tesla T3SE power cord. Can anybody help with the comparisons between these two subs and how the two small Paradigm 110's can match up to my huge Svs. What would I benefit with the Paradigm 110?

Regards Bacardi
Conventional wisdom on this site seems to favor two subs even of lesser quality over one bigger or better sub-especially for music but tends to hold true for HT as well I've heard. This has a lot to do with room interaction and better integration rather than more ultimate volume output.
What's the problem with the PB13? just tested it, and found that it was one of the best performing subs they've ever tested, and it won their "extreme" room size rating. In 15Hz mode that thing is apparently capable of some serious low-distortion output. (I"ve never seen one before, so I can't comment on how it actually sounds.) Based on specs alone, I'm guessing the SVS would blow the doors off of the Paradigms. Even two of them.
Irvrobinson; nothing's wrong with it. I think it would blow the doors off the Seismic 110's. Won't have the speed of the two. My initial plan was to buy a SVS SB16 when it came out but haven't heard any news on its release date or final specs. I would actually keep the 13Ultra and run both. The 16 is a sealed enclosure with a 1000watts RMS digital DSP amp. For music the 16 would eat a lot out there(if comparable or beefier than the 13Ultra). The 13Ultra would handle the movies with low end crunch and headroom, and the 16 for gripping speed, dynamics, and authoritative snap and punch. I actually had a custom Hifi Pyon platform made for my 13Ultra because it only had little rubber feet that sat the sub too close to the carpet which made too much vibration. The platform was definitely a godsend to the issue and overall is visually stunning and utterly the most astonishing bass I've ever heard.
I am waiting for the SB16 but if it not released I might try two subs of the Paradigms. I think two PBS 13 Ultras are just overkill for my room and visually too big. I don't see how the small Seismic 110 goes down to 18HZ with its small footprint but two would be better than one. I run a full Paradigm Signature S1v2 fronts, C1 center and Adp1 rears. The two 110's would mate extremely well with my Sig setup.

Would you suggest anything else to me?