I really like the dark brown (and the highlights but I know those can be a pain to keep up).
I like the violet one, lol b/c right now I have mine dyed "Egyptian Plum"--very fun!
But my picks are:
#1: is your #4 pic, the dark brown
#2: is your light brown hair!
I agree, the platinum blonde can kinda look washed out (could also have been the flash/lighting too)