Graphics card options in current climate

[Ellay]

Upgrading, and taking 1 step at a time. I am using an i7-3770k and a 32 gb of DDR3. While upgrading an entire setup these would need to go but looking at benchmarks, an i5-8600 isn't "That" much faster than my old I7 overall.

So I'm looking at dropping a decent amount on a Graphics card and seeing where that gets me for performance, and then down the road upgrade the whole thing.

I currently use a 660 TI and saw an amazing deal on an RTX 580 4gb for $120, but it's only a 89% gain in performance.
If I went with a 1070, were looking at 219% performance gain
and a RTX 2070 is 260% performance gain. It's currently listed at $500.

Does going for the beast RTX 2070 just make the most sense since it should have the longest lifespan to be "current"?
and how long should I wait or should I for a price drop?

The end goal is to be able to 5 box in WoW smoothly and 4 box in Final Fantasy 14 smoothly.
Both games on my current setup used to run fine, but after graphics changes due to lighting and shaodws being a requirement, it just stutters. FFX14 literally freezes up and thats the one I'm most concerned with.