Since your using the z-4000 the 80 would be good for lights or accessories .
I have 2 80's and am using one for lights and a few accessories.
The other is not being used as I power the trains with a ZW.
What is nice about using them for the lights is that you can adjust the brightness if needed.
I also have a bunch of older transformers in a box if I need them. I picked them up God knows where.
Bull........figure out how much room you have and make your own plan.