Yes...build it slowly...at the end you'll have a bad ass PC...spare parts which will help you troubleshoot...and when something stops working you'll have replacement for that part...or with the old parts you can build another low end pc and use it as a secondary pc or whatever..
WD Blacks: Highest performance consumer grade drives made by WD. Spin at a higher RPM (typically 7200). There are WD Raptors or VelociRaptors that are 10k RPM drives that are even higher performance, but that sits outside their standard consumer market, and to be honest with the onset of SSD's, I dunno if they even make the Raptor line anymore.
WD Blue: Standard performance 7200 RPM drive. In the past these have been identical to the black except the controller has 1 processor instead of 2.
WD Green: Power saving. These drives are capable of a variable RPM that can go up to 5400. But when that speed isn't needed it is able to slow down to save power, and generate less heat.
WD Red: Nearly all Red models are actually physically identical in every way. The differentiating factor with these is the firmware. They retain all features of the green, like the variable RPM, but add in a feature called TLER (Time Limited Error Recovery) which helps with raids. In a RAID, if your drives do not offer TLER then they will often drop out of the RAID causing a bunch of needless reboots. What TLER does is when the drive detects an error or has an abnormally high seek time, it sends a message to the RAID controller basically saying 'hey hold up a sec and let me try to figure this out' so that it does not drop out of the RAID. This is why using Black, Blue, or Green is not advised in RAID as none support TLER.
WD Purple: From everything I have read these seem to also be identical to WD Green/Reds physically, although I can't find anywhere to confirm this. It also has variable RPM up to 5400. Their firmware also supports TLER. The difference on these drives also seems to be mainly firmware as it supports "AllFrame" which according to the WD website seems to be some type of video compression and caching algorithm it uses. I have never seen one in person and don't know much about them so I can't tell you much more than that.
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