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Thanks everyone for all the suggestions. So many experts here. Most people have good feed back with 128GB on boot camp. Want to challenge this? I'd love to hear your opinion. :) Otherwise, I am ordering the 128GB in a few days.

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Actually, should I go with Pro instead? Few people are pointing out that Air is not really meant for programmers and boot campers(who does programming).
 
i dont think people should suggest SD card as a replacement of more space. the sd card is soooooooooo slooooooooow. in theory using an sd slot sounds like a cool idea in practice it plain sucks. i think you will be ok with 128 just dont consider sd slot as an alternative
 
i dont think people should suggest SD card as a replacement of more space. the sd card is soooooooooo slooooooooow. in theory using an sd slot sounds like a cool idea in practice it plain sucks. i think you will be ok with 128 just dont consider sd slot as an alternative

Potentially you could store media such as your iTunes library on the SD card and the slow speed of the card would have little affect on playback.
 
Def not enough...
I use 80GB of boot camp for my Win 7 Ult and i still dont have enough.
128GB subtract 80 is 48GB
So you need around 20GB for boot up and thats 28GB left.
28 isnt much...
 
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