If you have a PS4 at the moment there is no need to go to the PRO model. If you are new to the next gen then PS4 PRO is the way to go. I would probaply hold of until E3 2018 to see if there will be any price drops but that's happening at June and it's not guaranteed that they will drop the price.
I upgraded my setup to ps pro and dumped a Crucial MX300 1TB drive in it and then bought a 4k gaming monitor (LG 32UD99). The SSD upgrade was because of the monster hunter load times!. Much improved on that SSD. If you can afford it, and have a good 4k setup go for it.