Any of those HDD's will be stable, each are as likely to break as each other. Only difference is price and performance.
Greens - slow, minimal energy savings (nowhere near worth the loss of performance), generally same price.
Blue - Mid-range, average performance.
Blacks - Faster and more expensive.
There are also Red drives, which are a mix of Green and Blue and optimized for mass storage (talking large scale business server stuff). They have no real use in desktops though.
Or bail out to Seagate, their Barracuda range is a bit faster than the WD Blacks and is much cheaper.
Seagate Barracuda 1TB 7200RPM. $90http://www.newegg.com/Product/Product.aspx?Item=N82E16822148840