it also depends upon luck .. if you get a Ryzen 1400 that can easily overclock to 3.7-3.8ghz then B350 + 1400..
if you get a ryzen 1400 that doesn't overclock to more than 3.5 ghz , then A320 +1500x while being cheaper with a better cooler..
like this Got a terrible 1400 :( • r/Amd
in most games you will be GPU bottlenecked , in a few games where higher clock speeds will matter , freesync will take care of low fps or drops below 60 fps..
with Freesync even 45 fps feels smooth ,
My experience with FreeSync. • r/Amd
Freesync is the bomb. • r/Amd
Just got an rx 480 and am finally able to use FreeSync. Oh my God... • r/Amd
read more on reddit..
i would put money into getting the monitor first ..much better visuals , Smoother Gameplay experience than few extra fps i could get with a slightly better CPU or GPU ..
So my opinion is Freesync + 1400 + A320 within the limited budget . .than skipping monitor and going for better CPU ..
check these
AMD Ryzen 5 1400 Review
rest research more and decide or let other members give their opinion..