Just found two psu from seasonic, both full-modular, no 80-mm fan though:
350W: http://www.jonnyguru.com/modules.php?name=NDReviews&op=Story&reid=277
500W: http://www.jonnyguru.com/modules.php?name=NDReviews&op=Story&reid=276
Wow, this is the ultimate case I've beed dreaming about. I hope I can buy this as soon as possible.
And about the PSU you are looking for. How about this PSU:
https://www.amazon.com/dp/B00LPTY2HM/?tag=theminutiae-20