Hopefully you found your thread in the proper location here.
That's pretty sad that in your climate they only offer 13 SEER stuff. You sure don't need a higher efficiency furnace but a high SEER A/C which would require a furnace with a efficient blower motor would make a lot of sense. You can have the PSC motor swapped for a high efficiency motor, a couple of brands make a motor for that purpose. That would unofficially bump a 13 SEER to a 14 SEER and save a couple hundred a year if you run the fan constantly.