Don't know much about that Antec case.
It seems to be OK for the price, but I'd advise to take a look at Fractal.
Fractal cases are super popular with NAS builders for a reason, e.g. Fractal Node 804 ($125) or Fractal Define 7 (XL)
https://www.fractal-design.com/products/cases/
But the cheaper Fractal Node 804 case is designed to only accept mATX boards.
Therefore it's probably a no go for you since it's difficult to find any reasonably priced LGA1200 mATX boards with 8 SATA ports.
Fractal Meshify 2 or Define 7 might be better fitting.
They have lots of room for expansion, but come with only 6 HDD trays included.
I don't know where users get extra trays.
I heard it wasn't easy in the past. The situation might have changed by now.
Which model of a Corsair PSU?
Yes, it's a quality brand overall but every brand has its share of duds. Here's a list of high-end (look for single rail) models to choose from (if fits the budget):
https://cultists.network/140/psu-tier-list/
Boards with Intel LAN are preferred and work just fine, but Realtek shouldn't give you much of a problem either.