mixers

I am now baking out of a 30" round mud oven and I want a mixer that can mix up more dough than my Kitchen Aid 5 qt.  I have no beef with the KA, but I need more capacity.  Wondering if people have thoughts on the following:

KA 6 qt

DeLonghi 7 qt

Viking 7 qt

New Cuisinart 7 qt

Electrolux 8 qt