The flickering screen sucks, but I would not say it is a deal breaker. It can be partially improved by using the DVI-VGA adapter with the cable (supplied with PowerBooks and Mac Book Pros) instead of the standard one that comes with the Mini. Some extra work on cabling might help even more.
I have recently used a G4 Mini in my new V480 installation. But the Range Rover and Saab will both get Intel version.