- the Blue series is a nice starting point
- the Black series provides a slight performance edge and longer warranty
- I used the Raptor 10k RPM drives for most of my builds the last couple years, but, with SSD prices falling those drives have now faded into irrelevance for future builds
- the Green's are great for super high capacity at the lowest possible price, I use 'em for image backups and archiving
If you're in the U.S., Newegg has sales on hard drives every week. You can frequently get a 1 TB for $60 or so. Yesterday a deal expired at Newegg for a "Western Digital WD10EZEX 1TB 7200 RPM 64MB Cache SATA 6.0Gb/s 3.5" Internal Hard Drive, Blue - OEM" for $59.99.
I've had no problem with Caviar Greens. I use two of their 3 TB drives (WDC WD30EZRX-00DC0B0) on my server and get 113 MB/second read/write speeds when copying over very large video files (3-12 GB) across my Gbps network. But it's been a couple of years since I've used their 1 TB drives and cannot remember what my read/write speeds were on those.
OEM hard drive means it comes "bare drive" Only, no SATA cable and no mounting screws n hardware.....
So, you SHOULD have the cable and screws available to you that came with your case and/or motherboard. So, ahead and order the OEM version, it will be slightly cheaper that the full retail packaged box (or yeah, the OEM doesn't come in the pretty retail box either, just a plain carrier...)
Look at the last photo, contents of the box, appears to be two (2) SATA cables included. That seems about right. One for DVD drive and one for your hard disk drive. If you have more drives, then you'll need to order a few more cables...