Do I need a new psu?

[unrealsword]

I'm thinking of building a wc system and was wondering: will my psu suffice or am I pushing it already? I currently have 6 fans in the pc that I would like to replace for quieter ones and run 4 or 5 fans in the loop as so:

So far I've been recommended the fesser x-changer 120.3 and 120.1 radiators
I'm not sure what fans/tubing/pump to use yet nor how fittings work. I am looking to spend around $600-700 for the wc system.