In case anyone is wondering, here's what my current build plans look like. I still need to buy fans and some Molex to fan 4pin power cables, but I'm holding off on those until I get the case.
Fractal 804 case ($142.91) https://www.amazon.com/gp/product/B00K6OVG0I
(10) Seagate Exos 14 TB drive ($2090) https://www.amazon.com/gp/product/B07T63FDJQ
Intel RAID Expander Card (RES2SV240) ($155) https://www.amazon.com/dp/B0042NLUVE
Power Supply ($94.50) https://www.amazon.com/gp/product/B08PDV45F8
(3) Mini SAS to SATA Cable ($41.97) https://www.amazon.com/gp/product/B012BPLYJC
Sata power cable splitters ($6.99) https://www.amazon.com/gp/product/B07T356R21
Sata 90o angle adapter ($6) https://www.amazon.com/gp/product/B07P5N714P
Total cost: $2442.87
This SAS card is what I personally use and then use these breakout cables.
The PCB is green unfortunately but Art of Server is a great seller and I would put reliability over aesthetics personally.
This one is what I use in my 'desktop' [Fractal case] Plex server since 2020:
amazon.com/gp/product/B0085FT2JC/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
You'll use these cables:
https://www.amazon.com/gp/product/B012BPLYJC/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
Look up fan mod for the card, I used this little boi:
https://www.amazon.com/gp/product/B009NQLT0M/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
It's basically plug and play. The fan "modification" isn't too hard. The card is considerably cheaper now than it was in 2020. My server is completely stuffed with something like 9 drives and 3 SSDs plus a GPU so the fan mod was to keep the temps 'reasonable' in my stuffed case.
I've used these many times, across multiple projects, for many years and never had a problem
https://www.amazon.com/Cable-Matters-Internal-SFF-8087-Breakout/dp/B012BPLYJC?th=1