External Hard Drive and Enclosure - Advice Needed

OS: Windows 7
Motherboard: Gigabyte S-Series M68M-S2P
SATA II (3Gb/s)
USB 2.0

I want to add an EXTERNAL hard drive, 2 TB most likely, to my system to be able to stream video over my local Wi-Fi. I am concerned that 7200 RPM speed will run hot or that 5400 will be too slow to stream video over Wi-Fi. So I am also considering purchasing the HDD separate from the enclosure.

I also want to find an aluminum enclosure with fan. I may need to purchase an expansion card to upgrade to USB 3 (but, backward compitable to USB 2 might be needed.) The Sabrent USB 3.0 TO SATA/SATA II Aluminum Hard Drive Enclosure with cooling fan (EC-7F83) for $30.00 looks good (see Amazon).

I've been using internal 3.5" 1 TB and 2 TB Seagate HDD's for a while and have been happy with them.

Can you recommend durable reliable hard drive for this application?
Can you recommend an external case?
Do you recommend anything to stay away from, or problems to be aware of that I may not have considered?
Would you be able to recommend a pre-built, or better system for my purposes?

I don't want to spend more than $150 for hard drive and enclosure, so I am NOT looking for RAID at this time.
Jerry LOperations ManagerAsked:
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Rpm is statistically insignificant for your use. You need to carefully find a usb3 enclosure that operates at native usb3 speed. Not one that is 'compatible'

Lots to choose from go to you local computer retailer and tell them that is what you need. Should cost $35 or so. Anything on sale or under $25 is highly suspect
Same is true for the controller. But a internal PCI usb3 controller should be well under $30
here a 2 port USB 3 adapter card - under 50$ :  http://www.startech.com/Cards-Adapters/USB-3.0/Cards/2-Port-PCI-Express-SuperSpeed-USB-3-Card-Adapter~PEXUSB3S2
you can then use a drive docking station, so you can exchnge and use any Sata drive you like
here one for less than 25$  http://www.amazon.com/Sabrent-External-Docking-Station-DS-UBLK/dp/B00IKAQ538

**you could also use a PCIe to eSata adapter, to connect the drives; but i believe this will be more handy, and usable on all PC's

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Jerry LOperations ManagerAuthor Commented:
Thank you both. I decided to start with the hard drive for now and just mount it internally, since I may end up with either a dedicated server, or NAS. I called support for my 2010 (?) EVGA motherboard to determine if it had SATA 6Gb/s, which it does not. Nonetheless, he recommended I search for "Hard Disk Drive Failure Rates". So I did, and found out to stay away from certain drives, and that the HGST was a winner. This one at Fry's came in at $149 - HGST Deskstar 3.5" 4TB CoolSpin SATA 6Gb/s Internal Desktop Hard Drive.
Be warned .... 100% if disk drives fail.  It is a myth that with a sample size of one disk you can expect any specific drive to be more or less reliable than another.  

If you have a limited budget then the smart thing to do is buy whatever model costs you the least amount of money and mirror them.  That will give you significantly better reliability and lower risk of data loss then even a top-of-the-line enterprise disk from EMC that might cost you $1500.
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