Aren't those 3400/3200G a Zen 1.5? Would not buy those.
You want the newer APUs with Navi and Zen 2.
Not sure how much power limiting AMD does, I think it disables automatically when OC is enabled in UEFI, lots things used to get set in OC mode, disabled etc.
3600, 3700X will probably again be the most popular if you can OC or XFR/PBO + power unlimit them. You will never get the best binned chips, those are in Epyc unfortunately, the next bin goes to Threadripper and then to Ryzen. So I wouldn't worry about getting the lower Ryzen parts which get lowest bin chips, they cost the least for a reason but offer best bang 4 buck.
Unfortunately it doesn't seem that AMD is pushing prices down (and value up) at the low-mid range, only high end is getting cheaper a bit. 4C-8C costs same as previous Zen.