My favorites are my Powerbook 3400, my (sadly non-working) SE/30, and my current Mac mini (late 2012).
My G4 is an AGP 450MHz model, and that sucker has gotten noisy, anybody know of a good fix for the loud case fan? I’ve removed OS X from it now that I have the mini, and use it solely for trips down memory lane with OS 9.2.2 and running vintage apps and games.