Hey! I just got an 09 mac pro 2.26Ghz. I am wanting to put a new hard drive into it. I see on mac sales (OWC) that for the 1TB option they have a few different ones. Some go as low as $100 and as high as $170. What is the difference? There is also a high performance one for like $140?? Or well thats what it says. Does it pay to get the more expensive hard drives? The more expensive ones say Enterprise or Server in the title. What does that mean? I understand the whole RPM, and cache, but they are the same for the $100 one and the $170 one. Thanks for your help!