There's plenty of good choices out there.
Right now, I'm using a L'Occitane lavender-scented shea butter soap that i got as a gift. It's not very heavily perfumed, so once you rinse, the scent is basically gone.
For drugstore/supermarket soap choices, Dove (original or sensitive skin), Dial (original scent gold or white bar), and Ivory (all three varieties) seem to work well from my experience. All of them don't leave much in the way of scent on your skin, especially Ivory.
IIRC, original Ivory has the lowest amount of scent of any bath soap that isn't 100% fragrance-free. The Ivory Aloe and Lavender varieties aren't that heavily scented, either (and yes, they float, too).