Sun Ultra5 Workstation with Solaris installed
Bought is several years ago to learn Solaris but then put it on the shelf after a few uses.
Wikipedia description: (http://en.wikipedia.org/wiki/Ultra_5/10)
The Ultra 5 and Ultra 10 are 64-bit Sun Microsystems workstations based on the UltraSPARC microprocessor line available since January 1998 and last shipped in November 2002. These systems are notable for being the first in the Sun workstation line to introduce various commodity PC compatible hardware components such as ATA hard disks and an ATI Rage PRO video chip.
The Ultra 5 came in a "pizzabox" style case with a 270, 333, 360, or 400-MHz UltraSPARC IIi CPU and supported a maximum of 512 MB ECC RAM in four 50ns 168-pin DIMM slots. It included a single EIDE Hard Disk Drive of between 4 and 20 GB, a CD-ROM drive, three 32-bit 33 MHz PCI slots (two full-size, one short), a graphics port (HD15), a parallel printer port (DB25), two serial ports (DB25 and DE9), an Ethernet port (10BASE-T/100BASE-TX) and headphone, line-in, line-out and microphone 3.5-mm jacks.