I have been talking to my shop owner's about what suits are the warmest. The consensus is:
Bare Reactive (for men) or Evoke (for women)
Henderson Thermaxx
ScubaPro EverFlex (newer models with DiamondSpan lining)
Also, the new ScubaPro Definition suits claim to have "infrared fleece interior lining reflects body heat to ratchet up warmth even more". Sounds just like the Bare Celliant technology.
The warmest suit is really going to be the one that fits you the best. So, I would suggest trying all of these, if you can, and go with what fits most snug up into your armpits and crotch (as well as fitting snug everywhere else).
I got some new ScubaPro HD boots recently that have the DiamondSpan lining and they are ridiculously warm. My last weekend in our local quarry, my feet were sweating inside those boots - while I was in the water!