$60 seems very reasonable for the repair of a power supply.
I now have a 1.8GHz iMac G5 that is showing instabilities (on a rebuilt supply) and while the mother-board capacitors look fine, they seem to run too hot and I will replace those. My other 3 G5 iMacs (1.6GHz) are doing fine and their motherboard capacitors seems to run a lot cooler.
All 4 rebuilt power supplies are doing fine.