I saw you recommend the Winisis WT-02 case (which comes with TFX PSU) in
this post.
Looking at the internal layout it appears to have room for Mini-DTX, but they blocked off the second expansion slot.
In fact, looking at the specs at the Winsis website
here, it does list two form factors for the motherboard (170mm x 170mm and 170mm x 190mm).
Maybe someone should call them and ask for a version with that second slot made available? (It would fit every Mini-DTX board I have listed in this thread with the exception of the ECS H61H2-MV (LGA 1155) which is spec'd at 17x19.5cm (
EDIT) and BIOSTAR AM1MH (Socket AM1 board) which is 170mm x 191mm)