For multitasking I would go with an AMD AM2 CPU, I know others would say iNTEL but that’s only for 32 bit non multitasking apps, but those are my 2 cents. 512MB and multitasking? No way you will have enough with that, go directly to 1GB, 2 times 512Mb I’m talking about to use them in dual channel 128bit mode. Also buy 667 and not 800, that’s still to expensive. For the iNTEL CPU 533 will do fine with iNTEL chipsets, 677 for nVidia chipsets (my pick personaly). For games, and not above 70 bucks, then I would look at a 7600GS, there are fansless versions when you like silence. AOE III is asking more power then you think on higher resolutions and higher settings. Power supply, go with Antec, always safe. Don’t be fooled by "Vista ready" and "core 2 duo Extreme" terms, that’s just marketing .