FYI, just to have some closure on this thread.
I went with the Trane system with the following specs:
Air Handler: TAM7B0C60H51?A
System was installed yesterday. Had an additional filter grill installed to give it more intake air (builder should have done that to begin with).
I had a bit of a challenge with the Trane/Honeywell thermostat. Was really thinking of the NEST. Who knows what I'll do with that.
I was told that since we only had #6 wire at the air handler they had to reduce the 15KW down to 10KW on the heat strip.