Build a pc now or wait a few months?

AS the title says, I want to take advantage of the new Ryzen zen 3 but it's really hard to get them at the moment.. Same goes for any new or decent GPU it seems.. Other parts generally seem to be accessible. So do I build a PC with the possibly overpriced Zen3 and GPU? Do I hold back and get older cpu and gpu, then upgrade those at some point in the next year? Or just wait until the cpu/gpu components I want are more available and then build .. Assume I'm after the latest GPU for the sake of argument, i still havent made up my mind on what gpu to get, there's a lot of options. But Im leaning towards keeping the build AMD..
I am literally open to any suggestions or advice