Somebody stop me... (Gaming PC Build Thread)

[Blerpa]

So, I got a brand new mouse as who follow me on Facebook/Instagram may have noticed... an ambidextrous Razer Diamondback from Amazon Warehouse, for only 38 euro.
I went from my wireless Logitech mouse (Keyboard + mouse MK320 wireless kit) to a wired one, but it was worthy. And I needed an ambidextrous one as I usually play FPSes with my left hand while I use the right hand for anything else.
Very good grip, sensitiveness and precision: satisfied. And the mouse wheel click works way better than the one on my old Logi, had only to get used to the more elongated form of the Razer.

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Also a friend of mine working in IT gave away to me 2 stick of DDR3 ram. 4GB each... so I put them in my PC and now I've 16GB of RAM which is very nice to have.
They look weird as they are very thin, at first I thought he brought me the wrong memory type, but he then explained they are Low Profile size.
Indeed they fitted no problem on the motherboard and Windows recognized them right away. I've 4 + 4 + 8 sticks in three of the four slots available, but who cares about dual channel, 16GB instead of 8GB is good and is not like dual channel is that important compared to the memory change.
Only two things worry me. Minor thing is the two new 4GB sticks are PC3-10700 (so 667MHz) by Kingston while the old 8GB stick is PC3-12800 (so 800MHz) by Hyundai electronics... I suppose is no big as they will run at the lower 10700 frequency of the new ones.
Other thing, that I hope is not going to cause any problem is that the new 4GB sticks have a 1.5 voltage while the old 8GB stick has a 1.35 voltage as it is a Low Voltage ram: is that worrying, anyone?

So far my PC is:

AMD A8-6500 quad core
Thermaltake Berlin 630W 80 Plus bronze
16GB of DDR3 Ram as said just above
MSI R9 270X Twin Frozr 4GB GDDR5
Kingston 240GB SSD
Western Digital 500GB HDD (Sata-3 obviously)
AOC 27" 1080p IPS monitor (Display Port, HDMI and all that)

I've been eyeing RX 580 8GB prices over Amazon... but I'm waiting till Black Friday in case of some good sales. So far the prices are around 300 euro, which is a lot. Not convinced at all by same price 1060 6GB (the 3GB edition is terrible) vid card by Nvidia, the AMDs are superior in this price tier, and the RX 570 8GB is only 20-30 euro less than the 580, so why in hell skimp for just a little price difference?
I may cave in if I see a 250 euro price, or hopefully even less.
I reckon it is about the max I can buy for this PC, after this I'd be probably looking for a completely new one in few years.