Oooo, red PST sounds beautiful, I don't think I've ever seen one in red.I say go to the store and try a bunch on. For me, The One was definitely my red PST. I stop in at Chanel from time to time, but haven't made any purchases -- I love my little PST way too much!
I think you will know which Chanel is "you" when you find it. And you will love it.