Inverter Upgrade

Now that my house has finally gotten comfortable, it’s time to upgrade my inverter to run stuff like refrigerator, microwave, stereo system, computer, household appliances, air compressor etc. I want something with hardwire terminals. Over the years of researching it, I’ve always heard that I should get pure sine wave but I’ve heard form some that modified sine wave is good enough if the wattage is high enough.

My house: http://geriatricgourmet.com/Home_Off_Grid.html

So now I want to hear form some folks who have actually been living off grid for some years. How much wattage, pure or modified, what brands etc? Any suggestions?