ok so l herd that these colours make your teeth looks whitest.
in your opinion, or from experience please, what color is the best?
-aqua?
-black?
-darkish blue?
-light pink/lavender?

Light pink/lavender or aqua. They're light colors, so they wo not draw too much attention to the braces, but they're darker than you're teeth (white), which will make them appear whiter.
Black or dark blue are too dark and will draw attention right to the braces. It wo not help the teeth look any whiter, it will just make the braces stand out.

with dark color braces your teeth will look whitest as there will be contrast. for more information on braces you canvisit the following link
http://identalhub.com/ArticleSubCategories.aspx?ArticleCategoryId=21&Name=Braces
further they have the facility for free dental consultation by the dentist

go with light colours, they will make ur teeth look the whitest. do not do dark colours.

l think aqua does, they make mine look whitest when l get that color.

When l had braces l usually went with black because they by far made my teeth look whiter. But as far as general noticability of your braces, go for a lighter color.

and as you're a girl. i'd vote for aqua or lavender ;)