My two favourite Speedmaster models are the 3570.50.00 from 1997 with tritium and the tapered 1498/840 or 1499/842 bracelet. Love the vintage yellow tritium dial and the "newer" style tapered bracelet.
The other one is the Speedmaster 50th Anniversary L. Edition 1957 pcs from 2007. I love this model because of the enamel dial and 100-meter water resistance. It is equipped with the F. Piguet column-wheel Chronograph movement with Co-Axial escapement which allows the seconds hand to be engaged without any further tear or wear on the movement.