Personally if you go on amount paid and impact you have 3 that stick out for me..
Dwight Yorke, cost like £50,000 or something, went on to become world class...love him or hate him now he was brilliant.
David Platt, £200,000, 4 years later he's sold for £5.5 million after again being world class, and to think Graham Taylor HATED paying 200,000 for him!
Paul Mcgrath, career was "over" apparently...what was it? £400,000?, I dont even need to say anything more about him.
OTHERS - Deano, great impact...just needed another 5 or so goals a season though for me, Shaun Teale - absolute bargain and him and God formed a great partnership. Ian Taylor - part of a swap deal and turned out a legend.