Edit whoops too late ^^^^, mind you for free can't complain 
If you are going Intel i would hold off because as a result of this Meltdown thing its becoming apparent that Intel CPU's may see performance slowdowns, especially 4'th and 5'th gen ones which is what the 5820k is.
https://www.theverge.com/2018/1/9/16868290/microsoft-meltdown-spectre-firmware-updates-pc-slowdown

If you are going Intel i would hold off because as a result of this Meltdown thing its becoming apparent that Intel CPU's may see performance slowdowns, especially 4'th and 5'th gen ones which is what the 5820k is.
https://www.theverge.com/2018/1/9/16868290/microsoft-meltdown-spectre-firmware-updates-pc-slowdown
Windows 10 running on Skylake, Kaby Lake or newer CPU show benchmarks show “single-digit slowdowns”, but most users shouldn’t expect to see noticeable slowdowns
Windows 10 running on Haswell or older CPUs “show more significant slowdowns” and “some users will notice a decrease in system performance”