I personally would have adviced against buying a new build right at this moment unless you absolutely have to. According to some rumours, Nvidia will reveal and launch their new 1100 series this year. Even if you don't want an 1100 series, its release would push the prices of the 1000 series down.
Besides that, the cryptocurrency bubble is still going on. Will it pop? I dunno, but I don't need to upgrade my build right now which allows me to wait and see what happens. Who knows what might happen the next few months.