Buy the best company you can find to install your new equipment.....
Equipment is equipment....in the right hands it will last a very long time and will provide you with great comfort and reliability....in the wrong hands it will be the biggest money pit you have ever seen....
Did your quotes include a manual J (load calculation) on your home??
If not...keep searching for a good contractor.....
"Looking at a report on HVAC reliability published by a leading consumer reporting organization, here were the top rankings:
1. American Standard
In my 34 years in the fields as a HVACR service technician I have found all of them to be pieces of junk.......if they're not installed properly. On the other hand, neither of them pay me a penny to endorse their equipment so I can't tell you which one I would recommend to you.