Hi, (it's me, Florian from the fb group^^).
You wrote, that you are planning to get a second case, on muff I read that you can get some problems, if you mix different cases, cause they seem to have different zero V (or ground, idk). With 2 Inttelijel 7u cases you could solve the problem by linking them together. With an other 7u you should have also space for some buffered mults ^^. And if you go for the generative kombi you don't need the noise tools. When you are sure about a second 7u case, I wouldn't go for the duatt, instead I would wait and get a second quadratt for the second case and some mults and vcas. :)
Cheers Florian