I'm having the same dilemma.
I have the shoulder bag in whiskey and used a credit to get that same bag in black. But now after seeing the great pictures of the Pond color in the shoulder bag, I'm contemplating getting that too. So that would make 3 bags, for a total of about $1200. OUCH! But I love that bag and love the colors. I'm pretty sure I'll go for it, because if you really love the bag and the colors, then they are all different bags and you'll get equal use out of them.
I say go for it! WOW - helping you out eventually turns into me talking myself into getting a 3rd shoulder bag! Hm, makes sense!