I've got my eye on the SN850, I'll only need 1TB, the prices are dropping really fast and I am loving it, hoping for sub £125 (and £~15 heatsink) on Black Friday.
I have 176GB free at the moment.
Just install the Seagate Firecuda 4TB and it works like a charm. It is much smaller than I was expecting. The only hard part was taking the PS5 side plate off.