Sorry if I'm bothering you with this, but may I ask if (and how) the Thunderbolt Displays are powered by your discrete graphics?
I'm right now in the process of sorting out a build of my own whilst owning a Thunderbolt Display and I've read a couple of statements saying that you'll end up only using the internal graphic card powering the Display and thus 'losing' a lot of potential. From your point it looks sort of different, could you elaborate further?
Currently I'm planning on a Z97 Gryphon mATX build and the respective Asus Thunderbolt Expansion Card.
Regards,
Tom