FWIW, a warranty is nothing more than a bet. The consumer is betting they'll collect the bet and the manufacture is betting the consumer won't collect on the bet.
How long is anything expected to last? Two years, five years, ten years or eternity? The point, how long do you expect this receiver to last before you figure it's time to upgrade?
We got four years and four months out of our last LCD TV. The Marantz lasted two years, Marantz, with it's three year warranty, replaced the unit and in the end, still working, when we gave it away. Our new washer/dryer combo is two years old. Our A/C unit is ten years old. Both units we expect fifteen years out of. Our son is twenty-four years old and our relationship/marriage is thirty years old. The point, how long does anything last? Some things like a television, we're happy when it quits working (okay, the excuse I was looking for) and somethings like a relationship with a loved one, we want to last forever.
The point, you have to answer the question, how long do you expect the receiver to work before it's time to replace it.