WHATEVER YOU DO, DON'T GET IBM HARD DRIVES!!! PLEASE!
Here is my story. My friend was upgrading his computer, but his motherboard wasn't detecting his hard drive, so I took out my hard drive to hook it up in his computer, but one of the four pins on the back of the hard drive that connects to the power supply broke off! what the heck? So I called IBM right away and they told me it's a common issue and that it's not covered under the warrenty. They gave me a phone number of a company that fixes hard drives, so I called them and told them that my pin came off and the first thing they asked me was, "sir, do you own an IBM deskstar?" And I was like "yeah, how'd you know???" They said it's a VERY COMMON problem among IBM deskstar HD's. It was gonna cost a $75.00 plus s/h, so I just went and bought Seagate HD. I don't know about speedwise, but it's dead quite. So much better. I would go with Western Digital if you want a fast HD though.