Honestly Samsung drives are going to be really good options as are the WD Black. Keep in mind the Z490 will have two M.2 slots but one of them is shared with one of the PCI-E slots if I remember right. It also doesn't really matter that much for speed between the name brands if you are mostly using it for gaming. You are highly unlikely to personally notice a big difference since almost everything will open in the blink of an eye even on an old SATA SSD that is 1/5th the speed of the lower end M.2. Because of this I would look more at size than speed with 2TB now being pretty reasonable at around $200-225 if that is outside the budget 1TB is also good but 500GB and 250GB I would personally stay away from unless the budget is super tight. The Z490 wouldn't even really make use of some of the high speeds now offered because it's only PCI-E 3.0 so storage would be more important for that reason anyway. I have also noticed that modern M.2 are about the same price as the last generation but it's always worth comparing.