John Deere--Case IH --New Holland
Chevy Ford-Chrysler

Amana- Carrier--American Standard- Inter City-Lennox
Nordine products.
As many opinions as there are products.
IMHO you go with the product  who has a service man who will
show up when its ten below, and in the middle of the night.

Been doing this plg & hgt thing since 77.
If your just going for price, good luck.
You have no idea how many people get a "Good Deal" and than expect
a local shop to service them. 

Pay me now----or pay me later.