alright the two colors you've mentioned i dont know of any super long lasting colors without re-dying. but for purple ive heard that deep purple in special effects lasts a long time.
and for the turquoise fishbowl in the same brand it will be very nice at first, but depending on how well you bleach your hair, it fades differently for everyone. it may turn silvery, or an odd green, it just depends.
you'll probably get much more advice from the site administrators though, so i'd wait for their replies.
also id check out the gallery for more ideas.
Be very open and honest with who and what you are. If people still like you, fine, if not, that's their problem.