Yes, those are very hot. Also, I find breast size to be less important than other aspects. Obviously personality is important, but within the body, things like general curves, hair, skin, face, and of course: butt play a major role. From a purely objective point of view: I value the posterior more than the breasts lol, as long as they are a regular shape and even, they don't really need to be that big, long story short, don't worry about your small breasts, their not a deal-breaker, especially if you find a guy that actually loves you not just the way you look in a bikini.
Speaking as a guy who likes tall, thin, small breasted girls ...
Its probably NOT the best style for you. Now the good news is it probably doesn't matter, because the guys who are going to be drooling over you are going to be leg/ass guys, and they aren't going to care THAT much what top you have on.
But yeah, something with straps tends to look better on slim girls, imho.
Speaking as a guy who genuinely loves your figure, I think Claire Danes in this bandaeu bikini looks hot. I don't think push up bras and bikinis are needed when small breasts simply look so good on slim women. link
The bandeau tops don't have any uplift so they aren't the best if you are very small in breasts (so A) but they are good if you are a bit larger (like a B or C). I have seen a type of bandeau that twists a bit that ties around the neck that gives more boost if you have small t*ts. But if you don't mind looking flat chested that would look fine and you get smaller tan lines with bandeau tops.
I got one online from victorias secret last year, and although the design and everything is cute I agree it kind of flattens my chest so I wouldn't ever get another one in that style... I still wear it though. I say if you like it then wear it and don't care about what other people think. However I like the triangle tops/string bikinis more.(: