I rescued a perfectly functioning Graphite iMac G3 (600 mhz) from the dumpster. Has no OS on the HDD. I can get an official copy of the Puma (10.0-->10.1) discs for free. I worry that it may not work though?
Will work fine, frankly though I'd recommend Panther/Tiger if you have any access to them.. I used to run Tiger on a iMac G3 DV+ (400mhz I believe) with fairly good success.