External Hard Drive


Looking to purchase an external hard drive to attach to my Naim Uniti Star.  It will be used to rip cd's onto through the Uniti Star as well as hold hi res music downloads.  I've heard that Western Digital makes good external drives.  Are there much differences in the ones they make?  Mybook line?  Elements line?  Passbook?  Does the power make much of a difference (self powered vs usb powered?  Thinking of somewhere between 1 TB and 8 TB (likely 4 TB or 8 TB).  Thoughts?  Thanks!
david1963
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I can’t use a NAS right now because the Naim Star doesn’t allow ripping to a NAS (only to an attached hardrive.  May set up a NAS later after I have ripped my cd’s.  
SSD are much more expensive but much quieter and more reliable.  Ripping music is a lot of work.  It stinks when the drive fails.  You should either have a pc, NAS or second drive to back up to, especially if not using a solid state drive.
If you are talking bare drives be careful to distinguish between application types. My WD Green drives work well for my PCs application and WD Red Drives work well for my NAS Server Class application.
One decision is do I want long term storage possibly with backup or 
couldn't care less if the HDD frags ...