1. Which unit would you purchase?

I am having a new AC/Gas Furnace installed. I have quotes on
Carrier, Bryant and Trane (2 Ton, 13 Seer, 60BTU). Bryant came in the
least expensive, and I've been told Bryant is made by Carrier and is
just as good as a Carrier unit. Trane was $70 more than Carrier.
Since I have never heard of Bryant, I'm a little hesitant to go with
that brand.

2. Would you purchase an extended warranty?

We plan to remain in our at least 7 more years. Most quotes came
with 10 year warranty on compressor, 5 years parts and 1 year labor.
Would you pay an extra $500 for a Trane warranty good for 10years
parts and labor?

Thanks for your recommendations!