my pc can run halo at full settings 1024x748
cpu cost £40
mobo cost £20 (only agp4 but has onboard usb2,lan,sound)
graphics cost £90-100
sound cost can't remember but i think the onboard is pretty good
ram is dimm and u can get that for pennies now
do the currency conversions yourself if you want them but that's a high end pc for about:
£170 including ram (estimate)
could get a cheap case and psu which would bring you to about £200
there, that's a pc without a hdd for £200
edit: i got my dvd drive for £13 so with that it would be about £215 and with a 80gb hdd that would be about £285 or less
http://www.larinar.tk
AMD athlon thoroughbred 2200, 512Mb ram, 40Gb HD, ati saphire radeon 9600 atlantis w/128mb ddr ram, good creative-labs soundcard, cd-rw + dvd drives.