If you're leaning towards the turquoise, go with it. The thing with the turquoise is that you have to bleach your hair very light blonde for it to not turn out greenish. Purple also has to be light blonde, but not -as- light as the turquoise. I had purple in my hair a few months ago and it was pretty cool, but if you get Beyond the Zone's purple passion dye, it turns into a turquoise color after it washes out a bit. I think the teal will look better with brown hair though, just make sure you get it bleached good. I like the peekaboo under the bangs, I had that with several different colors and it looks cool, plus you don't have to do root touch ups very often.