Hi Ron --
As far as system sizing goes, you pretty much have to talk kilowatt hours, for both your usage and input, or no one will be able to help you with sizing.
You have two MPPT controllers that can take PV voltage up to 150 volts each. (Be careful of high voltage; use the Outback string calculating software online, it will likely tell you not to exceed 130v or so).
I would rewire both your arrays into strings of higher voltage.
And you'll likely need another controller -- you don't want to mix and match any PV panels into a single MPPT controller, as it will always track the worst performing array. I would personally get an inexpensive MPPT controller (the one from morningstar maybe) for the old Arcos, and use the 2 outback controllers for your new Kyocera string and the Solarex string.
DAN F