I used a 4 TB WD Green for 3 years of torrenting and no trouble. Now it's my security camera HDD as well as some other duplicate storage.
I've been using a refurbished enterprise drive from serverpartdeals.com for about a year and it's still going strong. Plus side: cheap. Downside: refurb.
Since it's torrents I assume it's not critical data, so it shouldn't be too big a deal if the drive fails. Buy two and put them in RAID0¹ if it's actually important.