Sorry for destroying your thread, Jim.
John,
Know that I would absolutely love a G5 to call my own and envy my sweetie who spend her day at work using one.
I however, must be surfing the web differently ("Surf Different"?) than you do as I don't (knock on wood) spend any time worth mentioning on removing worms, viruses or mal-/pop-up-/adware.
I guess that mean a Mac still is the costlier alternative for me, eh?
[friendly banter]
Good thing you're happy playing Halo on the Radeon 9600XT of the "top-of-the-line G5". Your wife's "OLD gaming PC" has a more powerful 9800Pro card (I'm assuming her newer box has an even more powerful card).

[/friendly banter]
/TT