A few days ago, I acquired a number of IBM xSeries servers — namely x206 and x226 systems — for my work at the The Software Freedom Law Center. We bought bare-metal, with just CPU and memory, with plans to install drives ourselves.
I did that for a few reasons. First, serial ATA (S-ATA or SATA) support under Linux has just become ready for prime time, and despite being a SCSI-die-hard for most of my life, I've given in that ATA's price/performance ratio can't really be beat, especially if you don't need hot swap or hardware RAID.
When I got the machines, which each came with one 80 GB S-ATA drive, I found them well constructed, including a very easy mounting system for hard drives. Drives have a blue plastic tray that looks like this (follow link of image for higher resolution shot).