I have the black large zippy that Diabro has on now, and the leather is very nice! I have seen a few on ebay, but I am worried about authenticity since I haven't seen one in black from a seller I know. But the one on Diabro is real and it's about the same as what I paid on Bluefly for mine. Yes, mine was real from Bluefly...
I don't think the large paddy on bluefly will be "too big" for you at all, since you are tall.
The zippy is more casual though, in my opinion. If you think you'd get more wear out of the classic style, then that may be the way to go. The ONE thing that you have to check is the color. Chloe was calling the dark grey "noir" for a while, and then when the true black came out, they called that "noir" too!
So when you see the color, "noir" you need to check if it's the dark grey or the true black...just a heads up, in case you didn't know about that Chloe quirk!