Go for something simple like a "Caramel skinny decaf double-shot grande latte"
Thanks to the people making helpful comments. I quote my first post;
"PS. I *know* Starbucks is expensive/overpriced/pretentious etc etc etc, just humour me."
This isn't about my love of Starbucks or any other coffee shop, this is about getting through the next few hours appearing I totally know what I'm doing in there, and can order something as if I've ordered it a hundred times before, and appearing that I'm really cool while doing it..
If I just order a standard filter coffee the game is up, i could do that in a greasy spoon, but i also don't want to get anything which isn't real coffee like one of those frozen iced ones..
I like strong black coffee.. but I want to order it maybe with extra stuff..
I was right to feel intimidated - its like a club of people who know what they're doing, what are us normal people supposed to do!!!