I can never see the benefit of going Platinum unless you are going to make of all the perks unique to the Platinum card. Generic Rewards-wise, it's actually not as good...assuming that's why you carry the gold. 

Starting Scores (Sept 2011): All lower-mid 600s. CURRENTLY: TU FICO: 785 (2/7/13), EQ FICO 762 (2/7/13), EX FICO 776 (5/11//13) (PSECU). Goal: Achieved! Now Maintain!