If your current installer still sells geo, I would look no further (as long as their pricing is good) since you have had a great success with them.

I am working right across the river from you in Grosse Pointe Park on a 6 ton vertical. I'll wave when I get on site!

If you noticed the "shoppers checklist" at the top of these threads, myself and other contributors placed brand last on the list of things for a reason. There are of course dissenting opinions, but many of us felt brand had very little importance with few exceptions. I see none of the exceptions in your list, though I have no experience with Northern.
Next Energy (Climatemaster) is the biggest seller. Bard just started making their 2 stage unit a couple years ago. It has fewer integrated controls which makes it simpler to service (which is among the reasons we chose it to market to Do It Yourselfers). All have same compressor, similar components and sometimes a common engineering staff.


Your best chance satisfaction will be based on the dealer you choose. If the one that put your system in 20 years ago is available and you have been happy with them, they and their product should have "home field advantage" over other bidders, even if they cost a bit more.

Good Luck,
Joe