A 1050-1100w should be enough. See if you can get a cheaper psu.
How many hdds do you mean by a ton?
All depends, right now 4 HHD'S 4 SSD's but as those fill I always buy more. I have 9TB on my NAS full, 4TB's in my current computer full, and a bunch of misc drives in boxes (about 10TB sata 2 and 3) full. I never delete anything