To add to already great reply here, I heavily suggest AMD AM4 unless you are an Intel guy specifically, as you get a much better deal imho ,on AMD at least prices I’m seeing on NewEgg.
Similar prices between amd/intel ,but the HUGE difference on a 1 to 1 comparison, is AMD 6 cores and threads so tons better in lighting builds or anywhere else that applies. Material compilation maybe don’t recall positively.
As always IF you can afford 128gb ram GET IT :)) If you can swing it,you’ll never regret it, tho it can be hard to find 16 or 32 gb only sticks given you positively want to maximize your motherboard so 64gb means 16gb sticks IF again you can afford it and conversely 128 ,depending how many ram slots you have may mean 32gb sticks but depending how much ram speed you want might me you can’t maximize. YMMV but those are important things to consider. The rest is obvious, wifi ,Pcie4, usb 3.1 gen 2 , M2 blah, make a GOOD choice as funds allow to avoid regret later 
OF NOTE, unreal dev I’ve seen post on answer website say, claim,that past 32 you have ‘diminishing returns’, don’t recall precise reasons, but even if true and I assume it is, YOU DO want as much ram as you can afford, bc we all know how important multitasking is for a multitude of reasons.