Which is the Best and Cheapest Term Insurance Policy?

am 32 years old. I would like to know the following
1. Which are the companies which provide the best quotes for Term Insurance? Are the quotes for these companies available online?
2. How much Term Insurance Coverage you
3. How many years should I take cover for – is maximum duration really beneficial
4. Are the Private Sector Companies reliable? How are we protected if one of them collapses tomorrow? Or should we go for only LIC and SBI?