Multicast Imaging for Mac OS X?

ATomkins asks: "The school where I work has 128 new G5s which will be set up in a couple of labs. We want to completely re-image all G5s at least every semester. Ideally, we would want to use something like Ghost to push the image out to all the Macs at once; with Dell boxen, under similar circumstances, this takes about 20-30 minutes. Is there a viable alternative for OS X?" "So far, among other things, we've tried NetInstall and ARD2, which preformed horribly, taking over 200 minutes using GigE. Our best solution has been Carbon Copy Cloner over FW800, but that costs a lot in terms of labour. UDPCast over a Gentoo LiveCD image (distributed via NetInstall) seemed promising, but is being troublesome.

Assuming block-level unicast isn't an option, does anyone have any ideas how we can make this more automated?"