I don't have time to go through all the crap to meet this challenge but here is a pre-built computer that meets the specs of the emac:
http://shop1.outpost.com/product/4199463, $279.99
It should be no problem finding a 32MB 9200 vid card and a 17" CRT monitor for $120.
Personally, I think the author lost all credibility when he tried to mask his Dell vs Mac arguement as a PC vs Mac arguement. If you are comparing a low end PC to a Mac you should be looking at an EMachine or a GQ brand. On the high end, a comparison between an Alienware PC with either the best P4 or FX-53. Alienware offers more levels of customization than Dell does. You can pimp the Alienware out to the point that you are paying over 7k. You can also pimp out the Dual G5 up to well over 10k.