Inverters - Some Q&A

I'm sure this has been posted somewhere but I'm not finding the posts at the moment and searches on other forums are giving mixed results.


Pure Sine VS Modified Sine


I'm aware that for appliances running motors etc, Pure sine is the way to go, my question is, to ONLY power LED lights in a room or two, a PC and monitor (Maybe a TV as well), and my Fiber router and WIFI would Modified Sine be acceptable? 


Secondly, what power rated inverter?