I wish there were friendlier PSUs to these kinds of setups. Standard ones are often too large (yes even SFX), overpowered, with too many different cables instead of focusing on high efficiency at low loads and the specific connectors for disks.
If you use 2.5" drives you only need a 5V power supply, which makes improvising one much easier.
I’m personally still very much interested in HDDs with their better cost/GB, though it is true they have a shrinking lead over SSDs. I hope to move to SSDs completely for large storage space.
HDDs are also available in 2.5", but yeah the real cost/GB advantage you can currently only get with large capacity 3.5" HDDs.
I really enjoy the Hardware Haven videos. He makes things more understandable for a newbie like me.
This is relevant to my interests…