I bought my current system back in 2014(pre-built) and it has:
i5 3340s
an old mobo
8gb ddr3 1600mhz ram
240gb ssd and a 1tb hdd
an rx 550 4gb (which im going to replace)
psu 300-350w
and im planning to go with
r3 2200g
8gb 3000mhz ddr4 ram
msi b450m pro m2 mobo
rx 550(replaced with an rx570 in a while)
same ssd and hdd
and a better psu
also, is my i5 going to bottleneck hard if a get an rx570?