[PirateEggs]

If you haven't already got the HD, I would recommend a Caviar Black, I think the Greens are only 5400 RPM and that is not good for a primary hard drive. Especially for boot drives a 7200 RPM is the minimum and you would just be bottlenecking your entire system with a slow HDD, you should get a Caviar Black 7200RPM.
Unless of course the Green is infact 7200, then don't worry.