You don't need a Wonderbra for rockin' cleavage, that's for damn sure, especially at your size. You don't even need a padded bra, if the bra is designed correctly.
May I recommend the lightly lined Body by Victoria:
Full Coverage Bra - Body by VictoriaŽ - Victoria's Secret
If full-coverage cut is not to your liking, they have other cuts that are lightly lined.