With lots of money:

Robinho: Santos (On mine he had release clause of £13m, if not then structured deal of around £20-25m)
Daniel Braathen: Skeid (Release Clause of £250-£350K, or structured deal of around 1 mil)

With less money:
Daniel Braathen
Alessio Cerci: Roma (Under 17 so costs 650K)

Also Consider:
Nicholas Anelka (Man City)
Jermain Defoe (West Ham)
Javier Saviola (Barcelona)