£500 to spend on build

[samhain]

Don't need power supply atx box, but need motherboard, cpu, fan, ram, Graphics card, hard disk.

For father in law and he tight as hell, he can afford higher spec but.....

He used autocad which is really intensive so need good spec, I personally would go Core i7 but no way I can get near at that price even a self build.

Suggestions welcome.

Thanks