Question about DS stock fans and rtx 3080 water co

Im putting together a high end $6500+ Aventum build. I know most of the hardware I want but im stuck on 2 specs:

1. Fans. Ill be hydrolux water cooling and OC’ing a 10900K and RTX 3080, but im unsure if I should upgrade the fans. Are DS’s fans good quality and rated for radiator and case use or should I upgrade to thermaltake or corsair fans? I dont care about noise or RGB, I just dont want to install crappy fans on a $6500+ gaming rig if it’ll limit performance. System will run 24/7 for gaming, cybersecurity training (multiple VM’s), torrenting, photo editing, video encoding, and hosting a Plex media server.

2. Water cooling RTX 3080. Ill be using nvidea’s auto overclocking/boost on the 3080 because ive heard they have crashing issues when OC’d too high, so is it worth adding an rtx 3080 to the water cooling loop (aventum case) in terms of gpu performance?

Im maxing out my budget if I upgrade the fans, so if DS’s fans are good on the aventum x case then I’d rather stick with the stock fans and put the money into a larger m.2 drive. Again, I dint care about fan noise or RGB lighting, only performance and longevity.

Current Build specs:
Aventum case
MSI Godlike MOBO
I9 10900K w “stage 2” OC
1200W psu
32 GB corsair platinum ram
500GB Firecuda m.2 drive (OS/programs)
2TB Firecuda m.2 drive (games)
2TB samsung 860evo sata ssd (pics, video, VM’s, other storage)
8TB NAS HDD (backup and Plex media server storage)
DS’s custom hydrolux water cooling loop for CPU and (possibly) GPU
14x stock DS fans for case and radiators.

Thank you in advance for any advice!