For the Psu-s
I have a question. If you have a machine what eats about 700w and you have a 850w Psu, what will you do if somhow we can overclock them and need some margin?
I have a 1500w psu and a lot of big fans to answer this.
But it's only a theory......
A 850W quality PSU will most probably be enough even for some overclocking if possible, granted a Jupiter uses less than 600W DC power.
And you'll have a psu at 100% load.
Personally I don't like it. (It's my fault)
You just assumed that any future overclock will require additional 250W?
Maybe

If that is the case I can always buy another PSU and use it together with what I have. There is no restrcitions on how many PSU you can use with a single miner as long as it is more than 1

I have 2 Jupiters each on a CM V850, so if any need arises I can just get a 3rd one and use it for both Jupiters.
The power requirements are quite flexible.