Dynaudio X12 upgrade

Hello to all
I presently enjoy Dynaudio Excite X12 which are quite good, but IMHO the weakest point in my setup. Thinking about Special 40, but not quite sure are those going to be adequate. I really like Dynaudio house sound (or lack thereof), but I need a speaker which can deliver Orff's Carmina Burana and Pink Floyd's Echoes with the same grunt and finesse on lower as at higher SPL. So, before I start creeping around dealers and lugging speakers to my home, I thought to ask for a opinion(s) here.
My amplifier is Bel Canto S300iU, and I'll try to paint the picture like this: Low SPL right now is up around 50; X12 finally coming to life around 60; unity gain is at 80 - and X12 start clipping... If they could talk, they would start cursing around 75. 
I would like to stay with Dynaudio monitor. I do not think my room is big enough for C20, and I heard from others C1 Platinum is far better than C1 MKI (which I heard, driven by Moon) and can be perfectly happy at lower SPL, in a room of medium to small size, like mine (~400 sq. feet). Would it be good to save more money for C1 Platinum, or Special 40 would be "just the ticket"?
I appreciate all, but comments from owners who compared all three speakers would be the most welcome. 
Rest of my system:
Pink Triangle One / Nottingham Ace Space 9" / Ortofon Quintet Black into EAR 834P (primary)
Magnum Dynalab MD801 (background and news)
I would attach the photo of my setup, but I don't know how... Also, I apologize for my English, for it is not the best.