You don't need the liquid cooler unless you're overclocking the CPU for a start. 16 gig is plenty of RAM if its just gaming and standard PC usage. You haven't listed what HDD/SSD you might have in the old build but assuming the drive is still in good health it will be worth keeping.
As for black friday, its just a gimmick mate. Plenty of better deals go on throughout the year, especially for PC parts.