Potential upgrade ideas?

Greetings.

A year ago, you helped me put together a solid build for $750. Now I’m wondering if upgrading it actually makes any sense.

Current specs:
Corsair,
EVGA AMD Radeon RX 470
Intel Core i3-6098P (
Seagate Barracuda 1TB, 64MB, 7200rpm,
ASUS B150
Crucial 8 GB, G.SKILL Value DDR4 2133MHz
Kingston UV400 120GB SSD, 2
EVGA 500W

What should I swap out first? This PC is primarily for gaming.
Adding another 8GB of Crucial is a must; running PUBG and Chrome at the same time leaves me with zero available memory.

Last year, I paid $127 for those 8GB of Crucial, and now they're priced at $237. Is anyone actually sane? What is happening with these prices?
Would it be smarter to just sell this rig and build something entirely new?
I'm looking at an NVIDIA GTX 1080—is it worth putting that on this motherboard? Plus a new CPU? Is that even doable with a new power supply?
Let's say my budget is around $800.

edit: I forgot to mention that if it's cheaper, I can order parts from European shops that ship to Graz, like Amazon.de.

The real issue with memory is just the massive demand—especially from mobile devices—outstripping what's actually available in decent capacities.

https://geizhals.at/gigabyte-geforce...2.html?hloc=at
https://geizhals.at/g-skill-nt-serie...4.html?hloc=at

For everything else, I'd suggest hunting down a used Intel Core i7-6700, 6700K, 7700, or 7700K; buying them new just doesn't make much sense. Intel basically retired those older platforms with the 1xx and 2xx series boards just a few days ago with the release of the Intel Z370 chipset and Coffee Lake processors.

If I manage to track down a used CPU, will this motherboard actually handle an Intel Core i7-6700 and an NVIDIA GTX 1080? And what kind of power supply should I be looking at?

You didn't mention which motherboard you're looking at, but honestly, any decent one should handle an i7 just fine. That Intel series tends to run a bit hot and pulls a fair amount of power, so even the budget boards usually support them.

An NVIDIA GTX 1080 would work too, and I guess you might actually get a pretty decent price if you sold that RX470 now.

As stated in my opening post, I have an ASUS B150 motherboard. I found an Intel Core i7-6700 available; if I grab that now, will my current power supply handle it? And then, in a couple of months, I'll pick up an NVIDIA GTX 1080.

Gerald Ross8 said:I already mentioned in my first post—it's an MSI B150M Pro series motherboard. I found a Core i7. If I grab that now, will my current power supply hold up? Then, in a couple of months, I'll pick up a GTX 1080.

Personally, I’d wait and grab them both at once. Prices for used Intel chips from that era are just going to keep dropping over the next few months. If you jump on a Core i7 right now, you aren't going to see much of a difference paired with a Radeon RX 470.
Plus, you won't need a new PSU even with a GTX 1080. Under full load, a Core i7 and a GTX 1080 shouldn't pull more than 300W.

P.S.

The GTX 1070 Ti is coming out soon; might be a solid deal if you play your cards right.

And I find myself wondering, what sort of display are you currently utilizing for your sessions? I would be quite interested to know the specific resolution and refresh rate you are working with.