Tintin, we Just had our furnace replaced:
We got a Carrier, 120,000 BTU furnace, and one of those wiz-bang air-cleaners and because we are in Colorado (very DRY) we got a Humidifier. It set us back $5k, but I think it will do well, and the air cleaner is already cutting down on the dust. We live adjacent to 15 acres of open space, so it is more dusty in our area, than if we lived in a "downtown" environment.
Hope this helps. We bought Carrier furnace, because we had a Carrier Air-conditioner installed, and wanted to use same company - good service and prompt and trustworthy.
We also check "Consumer Reports" for researching what we thought we needed.
Best of luck!
Linda