The most obvious one would of course be Ibrahim Afellay from PSV. However, it's not a position we have to fill and I think he'll be joining a proven CL club, or maybe someone like Man City.
Also Jonathan de Guzman, Georginio Wijnaldum and Luigi Bruins, all three of Feyenoord Rotterdam. Think they could be persuaded to sell de Guzman or Bruins as they have big financial difficulties. Wijnaldum, I'm afraid would be out of our price range.
Moussa Dembele and Mounir El Hamdaoui, both of AZ. Dembele is a Belgian international and a very hot pospect. Mounir El Hamdaoui can play as a left winger and has already been linked with Barcelona, although I'd take that with a pinch of salt.
Danjiel Pranjic (SC Heerenveen), can play in every position on the left in defence, midfield and attack.
Keisuke Honda (VVV Venlo) Dutch 1st division. Japanese international, looks like a good prospect and there's lot of interest in him. Don't know if he's ready for the PL yet, though.