For a 5 grand machine dedicated to computer graphics, 512gb ssd is a very odd corner to cut. I would personally be looking at 2-8Tb So it can act as os, cache, storage etc. theres no need for a ton of different os, app, data, cache drives if you just get one decent sized one. A nice setup is a 2-4Tb main drive to work from, then a 8-12Tb spinning drive for archives, backups, asset libraries.
edit: gb -> Tb
For the ram, aim for 3600mhz if you can, this will allow the cpu bus to sync at its maximum speed, will give 4-8% more performance. 64gb is a good amount, but 128gb removes it as a possible bottleneck when working with large after effects comps.
cpu cooling, either a 240-280mm aio radiator. Avoid enermax, they skip on the liquid. Or a nice air tower like a noctua d15