john

I would expect the Armstrong to be the least expensive.

#2 and #3 are identical. Carrier and Bryant are sister companies. Was the Infinity/Evolution controller included?
what is mdl of evap coil? How about an air filter cabinet? new refrigerant lineset included?

post mdl number of the Luxaire/York furnace.

Carrier and Bryant are expected to release their new and full modulating furnace this summer which will compete with the York/Luxaire.

any warranty difference among the quotes?

qte #2 is a good price if it includes all from my list above.

IMO

#2 is probably the best deal. I would ask about upgrading the A/C to a heatpump. It shouldn't cost much and it would give you extra flexibility. Even if your not a huge heatpump fan you can run then only on mild weather (above 40 or so).