Is there any particular reason for it to be a laptop - an 11-year-old doesn't seem likely to be carrying it around school?
You can get a much better system for similar or less money buying barebones equipment plus a CRT or TFT monitor, now at remarkably low prices for 17in models.
or others from the barebones link in the left hand menu.
A 17in refurbished monitor at £20:
or Scan etc sell brand new ones at keen prices.