this is a sub $400 canadian build that will do some gaming (prices in canadian) (no moniotr, os, mice + keys)
mainboard : 45
psu : 20
ram : 40.50
cpu : 63
case : 40
gpu : 70
hdd : 40
dvd-rom : 20
total: 318.50 before S & H
after should bring you somewhere around 350-365
some rough benchmakrs for such a system:
batman: arkham asylum (high no aa or af 1440 x 900 resolution) 43fps avg
warhammer 40k: dawn of war 2 (high no aa or af 1440 x 900) 34fps avg
bioshock (1440 x900, highest no aa or af) 39fps avg
there you are proof you can still PC game in a modern world for the same price as some consoles!
myth: a gaming pc costs money.. definetely busted!