Steve,
I don't have any body I can recommend in your area,
I am a licensed HVAC mechanic (commercial) with 35 years in this trade, I don't do residential, sorry.
I am not well versed on makes of residential HVAC equipment but I work and talk to people who install/repair residential A/C & furnace on daily bases,
one thing I can tell you, it is very important that installation should be done by a licensed HVAC mechanic with good experience and reputation, equipment's make, model, warranty does not mean much if the equipment was not installed properly, A good mechanic will have good workmanship, piping practices like brazing and evacuating the lines (very important), equally important is a well maintained vacuum pump. contamination in the system is one of a major cause of premature equipment failure, proper electrical and thermostat hookup, proper sheet metal work right down to running the condensate drain,
A simple example is roofing, A 25 year shingle warranty means squat if the roof is not done right.
The reason it feels like a scam because there are too many fly by night "artists" installing A.C and furnaces. no different than any other trade. There is a reason you have to go through 5 years of apprenticeship to get your ticket.
A higher price doesn't always reflect higher quality of work, BUT at the same time, "GOOD" and "CHEAP" shouldn't be used in a same sentence when it comes to tradesmen, a good tradesman deserves to make a decent living.
I wouldn't install Goodman in my house. Trane and Keeprite are also not what they used to be, lots of bad reviews,
If you have any other questions, I can answer via PM,