Sony Bravia is the good one slightly expensive than other brands , check Samsung , Panasonic tvs as well. Go with 75" , since you worried about product reliability go with the brand which provides more years of warrant or extended warranty for 2-3 years. The life of a TV reduces mainly in india due to sudden piwercut and voltage fluctuations, use the UPS instead of stabilizer which will cost you max 6k , UPS will protect your tv from voltage fluctuations and powercut. TV keeps working for some time during powercut. You can safely switch off the unit. I am using UPS for my TV , for 4 years no issues with TV so far.
For Home theater , what's your budget ? . to build good theater system with 5.1 system it costs minimum 1.5 to 2 lakhs.
If you are considering below 1 lakh, then soundbars are the good option.