dell vostro 1700 celeron m550 (2ghz), 1 gig, 160gb hdd, nvidia 8600m gt, 17" screen.
not the best cpu.
£363 pounds delivered.
see dell deals here hotukdeals , MIKE T is the man
http://www.hotukdeals.com/item/163268/dell-vostro-1700-notebook-2ghz-cele/
about the best for your budget.
daggman