Question New gaming build advice

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Hi. I am planning on buying new components for my pc. I will keep the gpu that I allready own (1660 ti Strix), the psu (Corsair RM650x) and the case (CoolerMaster Storm Trooper). Inittialy, I thought I was going to choose to build an Intel based system (9700f), but seeing that some games already have started using more than 8 threads, made me change my mind. I waz thinking of buying an R7 2700x or an R5 3600 (btw, which one would you recommend?), paired with 32gb 3200 HyperX Black ram and for the motherboard I wasn't sure which one was the most stable (between Msi 450 Tomahawk max/x470 gaming pro max or Asus b450-e gaming). Now there are a few problems stopping me from making the purchase. First of all, which motherboard would you recommend? Secondly, I have seen a lot of posts regarding ryzen cpu' s reaching very high temperatures, as well as having high voltages (or spikes). Will the temperatures reach more than 70c with a mugen 5? Which of the 2 cpu' s I have mentioned would be the most stable when cooled with a Schythe Mugen 5? And lastly, do you thing it is worth waiting for Intel's new generation of cpu' s?

 

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Also, my current pc consists of an core i5 3350p that has been bottlenecking my gpu hard (lots of stutters), 16gb ddr3 1600. The motherboard I have is an Asus p8b75-v and I will also use an 500gb samsung 860 evo ssd. The other relevant specs have been posted. My budget is between 500 to 750 $ max.

 

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Any advice please?