Welcome to forum.
Recommend waiting three weeks more for getting Zen2 Ryzens into shops.
12 core/24 thread 3900X should cost pretty same as that 8c/16t 9900K.
Unless you like having all same Windows security patches needing vulnerabilities of same rebranded architecture...
Honestly Intel should be at most in 7th "generation".
Because only significant thing they've done since that 6th gen Skylake is cranking up clocks and increasing core count when forced by competition.
As for graphics card overall it's not that heavily used in video editing, unless you use GPU encoding.
Ability to use GPU varies between programs, so what softwares you use?
For reusable parts that 2400 MHz memory would be handicap of some degree to any high end CPU.
SSD and HDD again are perfectly usable.
Except for direct stream cutting/joining video editing is computationally limited.
And in fact for example in game loading times there's little practical difference between SATA SSDs and snake oil synthetic benchmarketing number NVMe SSDs.
Optical drive is another obvious keeper if you need it.
Case is also reusable, though could use some modding to improve cooling.
Myself would replace its rear exhaust fan's stamped mesh with goold old wire made finger guard.
Also front intake fan seems to be restricted by some crappy stamped mesh behind that front mask. (reviews don't have good pics of that)
If not able to do that then would switch all case fans to high pressure capable ones.
That PSU has cheap capacitors in it, so would at least put that to replace in couple years category, if you use PC lot daily.
(Coolermaster has only few actual quality PSUs)
Also that waterpipe cooler could have degraded.
Unlike space applications reliable heatpipes, waterpipe coolers have many degradation/wear mechanisms.
And it was never that good in the first place when just standard cooler like Hyper 212 is
better in cooling per noise.
So its adequency for todays high end CPUs is also questionable.
While monitor is reusable those uses would really benefit from bigger resolution.
Would personally consider 2560x1440 as absolute minimum just for web browsing and such general use.
And even that marketing BS 16:9 would be downgrade from 2560x1600 I've used for I guess 5½ years.
