CPU I decided on the Ryzen 5 2600 since it has incredible Value and is sufficient for my use case. I was able to overclock it to 4.0 GHz and the Wraith Max cooler, which I was able to get for 15$ is doing a great job while looking even better. Can not emphasize enough how happy I am with this CPU, multitasking works so well and all in all it is a great experience and the best bang for the buck CPU atm.
MOTHERBOARD Since I didn't plan on crazy overclocking or doing any other fancy stuff with the board I just picked an mATX B450 board that seemed to have some decent VRAM cooling. I had no issue this far and was able to overclock really easily thanks to the intuitive BIOS with voltage offset. One of the reasons for switching over to Team Red were that they are providing sufficient budget motherboards with overclocking capabilities. Would definitely recommend !
RAM To be honest I just got the only 3200 RAM which was listed on the QVL of the motherboard and was also available at the store I was buying the parts at. It ran at advertised speeds without any further setup does a great job. I didn't really care for the RBG but now that I got my first RGB parts I have to say that my framerate cosiderably improved and I will never go back.
GPU Now to the most interesting part of this build. I was able to grab the GPU for only 500 bucks and decided to go with it since I wanted and all AMD build and this is like the unicorn amongs the GPU's. First of all , this is the largest videocard I have ever seen and you should check if it will fit or not. I had to move my fans to the other side of the fron radiator bracket and due to the length of the card I don't think I would be able to fit a radiator for an AIO in the front anymore. After running the card at stock speed and voltage for a while I got a friend of mine to help me undervolt and overclock the card. My framerate didn't improve noticeably but it minimzed the coil whine that I was experiencing and also reduced temperatures and power draw. With a couple tweaks it is a great card for 1440p 120Hz gaming and fullfills all my expectations. But since I was able to use a GTX 1080 in my previous build I can say that from a budget and convenience point of view the Vega 64 doesn't make a lot of sense. I just wanted to save money on a freesync monitor and had enough of Nvidia milking customers for their last penny. So I voted with my wallet and don't think I will switch back to a GTX or RTX card anytime soon but if I was to build a PC for a friend who doesn't care about that stuff wants to save a few bucks I would recommend the GTX 1080 instead.
CASE I'll make it short. The NZXT H400 is the best case I ever had the chance of building in. Cable managment is really easy and you feel like they thought of everything. Keep in mind that I am only doing a ''simple'' air cooled single GPU build with no inherent challenges except the huge Vega 64., It looks great and build quality is also decent. I am using 2 fans in the front as intake and the 2 top fans and the rear fan as exhaust which resulted in great temps overall and kept my parts quite and cool.