The platinum sure is pretty, but the rose gold case with gray dial is such a fantastic, sophisticated look... it's probably my top choice of the PF Memory Time variations pictured here.
....but let me just add another for the 5100G - a technical standout for its time, which led many other brands to produce 5+ day power reserves after the 5100 was introduced, and an strikingly unusual, yet serious and beautiful watch to wear. Best of both worlds!