Damn those are large cases, for lan I would go with something similar to a Silverstone Sugo SG-07. Unfortunately I do not think they do them any more. This came with a 600W PSU and could fit a full lenght GPU.
I think
this is the replacement, more of a home theatre look to it.
I would prefer a SFF to a mid tower. But that is up to you.
Added: I have and love the sugo SG-07, have a i5 with a 6780 in it. Nice and powerful for a spare machine.