So am I going to need 2 monitors then if I have to rigs?
You can buy a KVM switch
Should I use ethos or windows with ssds?
For ethos a 16gb SSD is fine, for windows at least 120gb or more
Can I still mod bios to max MH/S
Yes you can
Will this be too much wattage for a 120v outlet? If so what can I do to fix it?
I am not aware of that
How loud is this going to be 60-70 decibels? Is there a way to reduce noise with insulation?
It's not going to be that loud. It's just the fans.
Ethos or windows?
With ethos you may have lower power consumption
And...
If you going to go for ethereum you should get 8gb cards