Don't think you can touch the three of Ibrahimovic, Campbell and Gullit.
Brad Friedel to Blackburn from Liverpool. Great keeper who went on to make nearly 300 appearances for them, and I believe he made something like 250 consecutive Premier league appearances.
Gary McAllister to Liverpool from Coventry City. He's an underrated, (perhaps unglamorous) and often forgotten midfield general and he was a key figure in their off brand treble success in 00/01. I believe Wenger has said before that McAllister was a player he was interested in signing. Probably one of the last excellent Scottish players, is that fair @Calum and @Electrifying? I could be forgetting a couple players since but I can't remember many Scottish players since of his level.
Jay Jay Okocha to Bolton from PSG. Can't stand Allardyce but all credit to him, in his early days at Bolton he pulled off some incredible transfer moves, and this is probably the best of the bunch I reckon.
As I said, none of them touch the top three, but I think they deserve a shout out.