I love the grey, it's a gorgeous colour and very versatile... I agree with GandB that you should choose one in person as the colour seems to vary a lot. I tend not to go for lighter bags as I'm terrified of colour transfer, the plaster pink is very pretty though, I guess it depends what you'd use it for and what would suit your wardrobe better .
Decisions, decisions! I love grey but somehow the Alexa in grey looks quite dull.
I am very tempted to get the plaster pink one myself, but worry I will get fed up with it quickly and it would be a one season bag.