The V210 (after picl runs on Solaris or the RHEL extensions on RHEL/CentOS) is super quiet, the V100 is quieter, the V120 (with the SCSI) maybe in-between. All three are significantly quieter than a T1000, in fact the V100 is quiet enough to be used under a desk.
I could never live with a T1000 in the same room or even the next room (or perhaps further). A great pity really as a T1000/T2000 would be a beautiful box under Solaris to test multi core/threaded apps.
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"Scud" East
Sun Blade 2500 'Silver' Workstation - Dual 1.6 USIIIi, 4GB, 146GB SCSI, Solaris 10U9
Sun V210, 2x1.33 USIIIi, 8GB, 73GB 15K, Solaris 10U9
Sun V100, USIIi 550, 1.5GB, 40GB, Debian Lenny 5.X