Tell a few contractors to give you a load calculation in writing. or
everything may be oversized, over size AC and you won`t remove much
humidity,you say humidity removal is important. I would not install an
80% or 10 or 12 seer in your area, but a 93+ and 14 seer or more. VS DC
run with a hunidistat-thermostat will remove the most moisture. A VS DC
can remove twice the hunidity as non VS DC but get a 10 yr warranty. You
have to research this as there are more option offered than ever before.
If you have the $ research, you have not been shown the high efficiency
equipment, or air filters and other options offered. Since there is a
health issue here what you pick may make a big difference. You say you
don`t have the time to research, but done wrong or not finding all
options you could of had and you just will have to live with it.