i'd recommend a sparcstation 20 with a single sm81 cpu, 128mb of ram, an 8bm vsimm to enable the onboard video, cdrom drive, type 6 keyboard/mouse, a 4.5 or 9.1g 10k sca scsi drive, and a sun trinitron 17" monitor
you can get this extremely cheap, and it will run solaris 9 (as well as openbsd...