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We got some interesting quotes for sure... all are with a 500-gal underground propane tank, transfer switch, wiring/piping and so on:

1. a 27kw Generac (water cooled) - $26K
2. a 30kw Kohler - (water cooled) - $34K
3. a 24kw Kohler (water cooled) - $19K
4. a 20kw Kohler (air cooled) - $15k
5. a 16kw Generac (air cooled) - $13K

All the vendors seem to check out... have decent reviews and a solid history and have the licenses in-house for the mechanical, electrical, etc.

We narrowed it down to options 3 or 4, and decided on 3 because that unit is more fuel efficient than the other and should run much quieter (water cool vs. air cool).

With the 24kw we should be able to run at least one, if not two of the three A/C units, fridge, and handful of other things at once... keeping us fairly comfortable during a prolonged outage.