@yycbride2016 You don't sound picky at all! It's your wedding and your vision, so you get to decide whatever you want that fits that vision
I think that black dresses with a teal sash would look amazing especially with the groomsman in black and teal too! It's too bad that the teal convertible dress isn't true to colour on the website (and thanks for letting me know - I was thinking of ordering that colour for myself as just a summer dress. I would have been so disappointed receiving the wrong colour).
@calgarybride2015 Thanks for your sage advice, as always I think the shade of teal I was looking for would be a little more contrasting with the water than others, but the more I think about it the more I want the dresses to "pop" in the pictures for lack of a better word. I'm thinking maybe purple with teal and navy accents (same colours, just different main colour).