This is why I'm sold on modular racks. I bought two Studio Tech modular racks, at $200 each, and split them up unevenly. A bigger one for the HT, and a smaller one for the stereo.
While it doesn't look as cool as rack mounting, its a lot cheaper and I guess perhaps with more ventilation. Future proofed too.
My NAD amp is 70 lbs as well, and on the bottom it goes.
My 4 pesos.