So far as I can tell, you are compatible.
Did you check that the ram you picked is on the supported list for your motherboard? You should, ryzen is picky.
But, I have some thoughts:
1. Assuming this is for gaming, I think you would be better served with a I7-8700K.
Some games are cpu core speed limited and the 8700K will overclock cores to perhaps 5.0 compared to 1800x at around 4.0
Then, how many of your games can effectively use many cores? For most games, that is 2-3 threads.
I see little prospect that the difference between 12 threads for the 8700K and the 16 on the 1800X will make any difference at all.
2. Ryzen responds to faster ram. Intel less so. But for a top end build, faster ram, say 3600 speed seems about right.
3. Top graphics cards are in short supply. Good luck in finding one. I think I would start with just one GTX1080ti.
You might win synthetic fps benchmarks with sli, but your gaming experience will be better with just one.
Dual gpu is prone to stuttering and screen tearing. More games are abandoning dual gpu support.
4. To provide for a second graphics card, buy a 850w psu. It will only consume the wattage demanded of it, regardless of the max capability.
5. Love the pcie ssd. Carefully decide how much space you will need for your games. It might be best to go 1tb if you will play many different games.
If you tend to play only a couple, then 500gb is fine.
6. buy your monitor carefully. It will be with you for a long time.
For better game immersion, I would look at a 32-34" wide monitor with a curve.
7. Will you have any valuable files on this pc? Family photos, for example.
If you do, plan on some sort of external backup for whatever is irreplaceable.
Lastly, in a nice case like yours, I think a top air cooler like a noctua NH-D15s would be my choice.
My canned rant on liquid cooling:
------------------------start of rant-------------------
You buy a liquid cooler to be able to extract an extra multiplier or two out of your OC.
How much do you really need?
I do not much like all in one liquid coolers when a good air cooler like a Noctua or phanteks can do the job just as well.
A liquid cooler will be expensive, noisy, less reliable, and will not cool any better
in a well ventilated case.
Liquid cooling is really air cooling, it just puts the heat exchange in a different place.
The orientation of the radiator will cause a problem.
If you orient it to take in cool air from the outside, you will cool the cpu better, but the hot air then circulates inside the case heating up the graphics card and motherboard.
If you orient it to exhaust(which I think is better) , then your cpu cooling will be less effective because it uses pre heated case air.
And... I have read too many tales of woe when a liquid cooler leaks.
google "H100 leak"
I would support an AIO cooler only in a space restricted case.
-----------------------end of rant--------------------------
Your pc will be quieter, more reliable, and will be cooled equally well with a decent air cooler.
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