Aviators would suit your face shape, but really wear any sunnies you want. Aviators are gud tho cos they’re really in fashion. Good luck finding a pair.

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Rectangular - as long as the outside of the frame is a bit wider than the widest part of the lower half of your face. Anything rounded will accent your face shape rather than balancing it. See link.
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they say alexis bleidel (from the sisterhood of the traveling pants movies) has a heart-shaped face. and i've seen her wearing aviators and square lensed Sunglasses. Just avoid the huge ones that take up your whole face and make you look bug-eyed.
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Doonie and Bourke…they are stunner shades and you'll pay a pretty penny for them, but you’ll not be displeased with them. I own a pair myself. =]
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aviator glasses would look nice….for more ideas google cameron diaz who has a heart shaped face