Do you really need pure sine wave for your tv's or are you happy with your modified sine wave inverter. My 750 Tripp lite inverter took a dump and now need to replace it. BTW it was not pure sine wave...
FWIW - I think the OP needs to consider future uses of electricity. As technology is evolving it seems that the newer devices are requiring "cleaner" power such as a PSW. Right now all of your elctronics are working with MSW, but what about future purchases? Why chance it? Invest a few extra dollars now rather than wishing you would had in a year or two.