Okay, I'm going to have to go against the tide here. I have four pairs of glasses myself, and I am big on experimenting with different colors and shapes -- so take my advice with a big grain of salt because my adventurousness may not be yours.
But I thought the soft brown modern rounded pair suited your face the least. There was something about the thickness of the frame and the shape that looked almost too-granny-ish, and well, not very modern, for me. Sorry!
That said, I think you look KILLER in the rectangle shape - that is a very modern shape, and it makes the glasses look like a chic accessory on you instead of something you "have to wear" (which is what the modern rounded feel like to me).
My favorites of the rectangles are the first modern angle ones (I think you need a little bit of definition color with a rimless style, and that one has a nice one -- you look very youthful, chic and confident in those!) and the lightest tortoise (love the shape, although I'm not 100% sold on the color, but I like it better than the other options).
I would recommend the next time you go to keep looking at rectangular or elongated unusual-shaped ones like the first pair, and with some kind of definition (color, wire, etc) on the top frame. I second Marianne's suggestion of maybe something with a plum instead of brown or black; I know you don't want to feel like a hipster, but oftentimes the color can be very subtle to still work.
By the way, you look really terrific! I don't see any of those famous "flaws" at all!