As far as i know, recently there's no more discount given for sports model. 2 years ago you can still get 5% off for Exp II but this is not the case anymore for now.
Popular sports models are Submariner, GMT-Master II, Daytona, Explorer, Explorer II, Milgauss, Sea-Dweller, Deepsea Sea-Dweller, Air-King, Yacht-Master etc
Good luck in your hunt and enjoy your the model you chose.