All,
Another possible thought, though definately not the cheapest. After we took over my wife's parents house after they passes, we did some major gutting. Part of this was electrical. The electrician added a 220v panel on the outside of the house, near the meter, the ran all new 220v panels and appliances from there, including the old main panel (now it's treated as a sub-panel). I have quite a bit of space to add more sub-panels and such (need one for the outside shed). A more flexible solution.
Steve