Looking for an advice on purchasing RAM

2x8gb or 2x16gb, that's the difference.

Did you check if these RAMs are officially supported from your Mobo?
General advise if you just want to play games 16GB Ram is more than enough, for Streaming, multiple Threads etc 32GB is better, but than your CPU is not the best for this case.

with that prices go for 2x16. I'm surprised that it says that 2x8 cost 135, I bought mines for 100ish

Intel don't need that fast ram and 32gb is to much for your needs.

Check if you can get a Crucial Ballistix Kit with 16GB (2*8gb) it should not cost more than 80€.
Maybe buy online from amazon (they ship to bulgaria)

and the RGB

Seriously? I had to buy some RAM, for my last upgrade and I was kinda shocked how hard it is to find a "normal" set of RAM sticks, that doesn't sound like some freaking rocket launcher, with fancy design and led lighting. In the end I picked a 2x8GB kit Patriot Viper 3200 for €85, simply because it was on sale and the other options weren't any less crazy. At least it doesn't have RGB, I still don't understand why someone would explicitly want RGB: if you want fancy lights, just buy some X-Mas lighting ;-)
Of the two options you linked I'd choose the HyperX, because in relation to size it seems much cheaper. Then again, 16GB should be enough for almost everything, so maybe pick some 16GB kit for around €80-90?

For gaming:

8GB - Not enough (yeah, yeah, in some cases it will be enough, but in many many many more, it won't)
16GB - Sweet spot, just right (for now at least)
32GB - This is really for that monster build, where you splurge on everything. Because when you do everything is so overkill so why not the RAM too, right?! And in such a build the extra cost for the RAM is hardly worth to mention as everything else is so steep anyway.

The Kingston HyperX is 40% cheaper per GB and probably faster. They are both 2666 Mhz, but the Kingston has lower timings. I don't know too much about timings, but the Corsair is rated at a CAS Latency of 16 while the Kingston is 13 (lower is faster).

The Corsair says it is tested at 16-18-18-35 and the Kingston is tested at 13-15-15. I don't know why Kingston doesn't list the last number or if it will even run at those speeds on all computers because it is listed as an XMP profile, but that is what they say it is tested to run at. They also have a second XMP profile of 12-14-14 shown here.

It depends on your use case. I like both Corsair and Kingston as brands, and have had great experiences with both.

Right now, for gaming, I consider 16GB a minimum (8GB already causes performance issues in some games). It's the price / performance sweet spot.

32GB is nice if you've got a bunch of other stuff open that you don't want to close out of - like if you have Chrome open with a couple dozen tabs all the time, and don't want to have to close out of it when you play a memory hungry game.

I would recommend getting faster 3200Mhz memory if you can - it improves frame times in some games which results in a smoother gaming experience.

Upto you (or the quality of the motherboard I guess) whether you use guaranteed or hopeful timings. Take the baseline speed (2666mhz) and divide by the headline timing number (CL13). Bigger number wins. Rough and ready way to compare ram sticks but it really is that simple, the reason you don't find reviews with benchmarks that go into anymore details is cause the margins beyond that are so tiny beyond that its not worth doing.

Enjoy your new toy :)

The more, the merrier.