IBM's SCSI ultrastar lines previous to the GXP were known for their high throughput and strong reliability. I've been using a U166 Ultrastar (don't remember the model letters, it's the line that was immediately previous to GXP) for almost a couple years now and it's been wonderful.
The other thing that is good with IBM is they have an online setup for obtaining RMA's, and their online system can tell you whether or not a drive is still covered under warranty (with ultrastar lines, it was usually 5 years)via it's serial number. No hours of struggling with tech support and digging around for ancient invoices just to get your damaged drive replaced.
