Oh crap, do try to avoid that.
I write this with G3, I also have a G4 ibook. That's not to mean I'm expecting these to run CM2, just to say we tend to stick with these things a bit longer.
I'm guessing intel graphics won't cut it, that already cuts the target in half. But then there's that bunch of G5 towers (which drift in homes secondhand) and G5iMacs.
Might be a moot point, if you guys are, as I suspect, going to keep your summer vacation sometime next winter...