I'd say get a better case with a better PSU as that one will be awful. Antec are good. I normally use the SLK1650B in customer builds.
Asrock (branch of Asus) S754 m/atx board, AMD Sempron, SATA2 hard drive, 512mb or 1Gb RAM, OEM Win XP CD.
You're looking at apx £250 for that lot ex the case.
That motherboard has got onboard graphics so as long as hes not a gamer it'll be fine.