First build doubts

[vpuyalto]

Hi guys
I've been a both PC and console gamer for a while now, but I've been hesitant about really getting into pc (mainly bc of the cost). I've finally built up the balls, done some reaserch and saved up the money to do so, but I need your help with the details
Here's what's in plan so far
GPU: EVGA GTX 1060 6GB/3 GB
CPU: Intel i3-8100/Intel i5-8400
MOTHERBOARD: MSI B360 PRO-VH
HDD: WD BLUE 1TB
SSD: WD Green 120GB M2
PSU: EVGA 600W
RAM: Kingston HyperX Fury Black DDR4 2400Mhz (1 8gb stick and a 4gb stick)
CASE: Cougar MG110-W
MONITOR: MSI Optic G24C (23,6", 144Hz, 1ms)/Samsung LS22F355FHLXZS (60Hz, 22", 5ms)
You can already tell my main doubts
I can technically afford this build as it is, but I'd like to have more money left to get a nice keyboard, headphones and games
The main question is: are 144Hz worth it? And in that case, is the difference between the processors worth getting a crappy keyboard and headphones? Is the push for the 6GB necessary? 
If it isn't worth it, then I might as well go for the i3 and hell, maybe even a 1050ti, since I won't really be able to see the difference in framerates if I'm staring at a 60Hz monitor
However, in a couple of years this probably will not get me 60 fps in AAA games on anything above medium quality, how much better off will I be with the i5-8400?
If I go cheap on all of the options above I'll save US$370 (470 if I go for the 1050ti), and it would work great at least for this year (PUBG, Fortnite, CSGO and BF1), but I don't know if the money saved will be worth having to upgrade a year or 2 early
As much as I can research, I don't have the experience you guys have; I'd love to hear some suggestions and, of course, feel free to recommend items that are not on my list
 

[Queen Chrysalis]

144hz is ony worth it if 60fps doesn't look good to you.  Andn to me, higher anti-aliasing and FOV effects at 60hz looks better than standard at 144hz.  Not to mention the extra money will fell better in your pocket.  The 8100 will be limited soon as more programs are using more threads these days.  With the discounts on the 1600 ($149 @ microcenter) the IPS improvements to Ryzen 2, as well as the faster RAM support on x370 and x470 MOBOs, its very hard not to recommend looking at AMD, especially if you decide to start getting creative and using things like Blender or Vegas.  Not to mention the 8100 is locked away from overclocking.  DO NOT get the 3gb variant of the 1060, it is leagues behind the 6gb variant.