You might consider upgrading just the mobo, cpu and gpu.
Same result. Saves me around $800.
it's a good option because:
psu's over 500W still good due to new cpu/gpu efficiencies.
cpu coolers dating back to (at least) sandy bridge still fit skylake
windows 10 free upgrade (ends july 29) saves $100.
my old sata ssd is fine. m.2 wont help much with games.
the new SLI high bandwidth only works with a few supported games and gains vary.
Well everybody's situation is different, just throwing that out there.