First off, I'm not sure I'd follow the advice of an installer who said the center speaker isn't important. I suppose if you live alone and always sit in the sweet spot, a phantom center will work. But, the center is usually the most important speaker of all for movies. It carries the dialog and you don't want the front stage to collapse for anyone sitting off-center.
I have Mythos 4 fronts, a Mythos 3 center, and a SuperCube I sub. My surrounds are DefTech BP/As (bipolar in-walls). This is a great room set up with a cathedral ceiling and no place to put rears for a 7.1 setup. I've been very happy with the DefTech speakers.