Luis Suarez
Arriving in a double deadline day deal, along with Andy Carroll in 2011, the Uruguayan proved to be a bargain at just £22.5m from Ajax.
Suarez may have been involved in a lot of controversies during his four years at Anfield, but he will be remembered for his goals, and his individual brilliance. His record of 82 goals in 133 appearances for the Reds shows what a shrewd piece of business it was.