Do not buy the GXP hard drives. Mine failed within 4 months.
I have two, running in RAID 0, in a Coolermaster case with dedicated fans. The other day one crashed with no warnings.
60GB of MP3's lost. If you look hard enough, you will find IBM documentation that mentions a 333 hour limit per month for these drives. Also, IBM admits the 120GXP's should not be used in servers. I did not know about this and used the drives fairly hard, doing alot of video editing and recording. Also, I use the PC as my stereo. Now the weather is hotter and I think this put the drives over the edge. But the case alone has 4 fans with a blow-hole out the top, so I don't see how I can do much better. I will trash my other IBM drives and buy WD. As a sidenote,
I bought an IBM SCSI drive (Ultrastar) and it failed the drive fitness test from day one. I sent it back to IBM who sent one out two months later. It works, but stills fails the drive fitness test so it's tough to have confidence it will last.