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Glad that was helpful. It was basically what I ran into when deciding how wanted to set things up years ago. Did I want lots of cheap moving parts, or do I want less moving parts for not all that much more cost-wise? After coming across a fuckton of "my RAID5/6 array is all fucked!" threads, the decision was easy. Either I care about complete redundancy, and use RAID1 or RAID10, if I actually wanted to save thousands of movies or something, or I don't and use RAID0/Linear.
I've basically just doubled my data storage a few times over the past decade and a half, starting with 2TB, moving to 4TB, and now finally 8TB. This has allowed me to easily re-purpose my previous old drives for extra redundancy.
Realistically, with a proper setup you can easily find 8TB drives that are cheaper than ultrastars. I personally like ultrastars because they've been the closest thing to a gold standard that is accessible to a consumer's wallet, and hey, I have a job and don't drink so that cost premium isn't an issue to me. But as long as you have redundancy and incremental backups (that can't get fucked by power surges, fire or theft), then you can easily get away with "perfectly fine" and even "adequate" when it comes to reliability. Another thing to factor in is the rate at which you acquire data. With my recent upgrade I should be set for another 4-5 years, at which point consumer-class phased holographic hypercube drives should allow me to double my storage again affordably.
The ultrastar HE8's were about $360 for an single drive.
Many same capacity RAID compatible drives should be around or under the $300 range. WD Reds were pretty solid last I checked.
Seagate's archive drive was about $220. Don't use this in a RAID array. They are meant for occasional use. Do incremental, compressed backups to these.
You can use a browser plugin called "camelcamelcamel" to see historic prices for an item on amazon. For hard drives, this tells you when to hold off buying. Stay away from oddly low prices and stick to the listings with hundreds of recent positive reviews.