If I had enough Money to share I would go for a Threadripper 2950X, at least 16 GB of RAM and a GTX 1080TI. The GPU will be hard to get new, but newer cards don't work with Poser.

A cheaper way would be the Ryzen 7 (this is what I use) and a GTX 1070TI or some other Card of that series. Newer cards don't work with Superfly, AFAIK.

I would never order a PC without SSD as a boot device. It's way, way faster than a normal HD as a boot device. Applications on a SSD are fine. Get a SSD for booting and a 4TB HD as a data drive. Make backups. I had more problems with hard drives than with solid state disks. Both can break, just use backups. An external disk isn't that expensive.

A ship in port is safe; but that is not what ships are built for.
Sail out to sea and do new things.
-"Amazing Grace" Hopper

Avatar image of me done by Chidori.