Correct me if I'm wrong but I seem to remember that the WD Green drives are 5400 RPM are they not? I definitely would not use a Green drive for the operating system!
For WD I would use a Black for the OS (most reliable)
This is the drive I use. While the problems you have listed probably won't be affected with the drive you have, I would choose the black for the OS as WD rates it more reliable and fast.
Another consideration: Which drive are you using for the pagefile?