Looking to replace old systems in a Chicago area capecod. House is brick 2 story. Approx. Sq.Ft.is 1100. I've taken 2 proposals at this time. Both contractors suggest Goodman 13 SEER A/C units. However, furnace choices are, Armstrong 63K B.T.U (G1D93AU67D12B) or Goodman 90 B.T.U with larger A-Coil installed<?...not sure which size fits the size of my home better? Also, we do plan on staying in this home for another 5-7 years. I'm looking for good running machines that are reasonable in price. I don't want ...All Show..No Go..stuff. Everything I've read is Goodman bad on furnaces, but good.. better.. on A/C's. Anyways, any assistance would be greatly appreciated.