I have only played the thermion through its stock cab...would you suggest buying the head based on how good it sounds through a cab that I dont intend to buy? and then running from shop to shop plugging it in to different cabs? or just plugging in to whatever cabs they have available at the store that stocks the amp? (I will get a wider variety of cabs to chose from by taking my own head from store to store, but I also dont want to buy it unless I know it'll sound amazing...)
I guess if I dont find any cabs that do it justice, I can always just buy the Ibanez 4x12...but we've been through the cons of that...

By the way, have you been to the Ibanez web page and seen the Thermion?
they have some clips up there and they sound amazing...has anyone else heard them? do they really sound that good or is it just me?