Help export the graphic with transparent background and not braking the quality

hi i'd please if possible.

 

i've created a  graphic in fireworks looks imac monitor , export transparent background.

the jpeg format looks great no damage graphic @ can't have transparent background, although changed canvas fill none. png-8 format can apply transparent background, damages graphic.

 

a ny ideas on how can export graphic transparent background , not braking quality??

 

p.s had posted , in here http://forums.adobe.com/message/4526456#4526456 images preview can check mean, redirected ask here.

you use 32 bit png format alpha transparency, file size might end pretty high. have tried 8 bit png format index transparency , 100% dithering?

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