Home users doesn't mean only 1 machine. Next time you upgrade to a faster machine keep your old one and start building your render farm. Even 'slow' machines due relatively well when they are splitting up the task of a render. I even use this old 333mhz iMac I am on now as part of my render farm for both EIU and Bryce. You'd be amazed at how fast animations and large images can crank out even with 'old' 'slow' machines. Food for thought. Also PCs and Macs depreiciate so fast you are better off keeping them than selling them at a loss.