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By long battery life you'll need to specify how long because as it most Netbooks right now will run about 5 hours easy and thats much longer than normal battery you'd have from Laptops, plus depending on how and where you plan to use it ( ie office \ college user with easy access to power ) you might not need longer than 5 hours battery too if youre going to connect it to a power socket. The clear winner currently among all the netbooks available here would certaintly be the Asus EEEPC 1000HE with a real life use of about 8 hours and 9.5 hours Optimum use claim.

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You dont have to worry about putting any knocks on Netbooks, they are pretty hardy. The difference between SSD and HDD though is the fact that with my SSD machines I have the confidence to throw up and juggle the laptop ( which ive done a couple of time ) without fear of messing of up the storage. Other than that though both HDD and SSD are hardy enough to take bumps into people and little jolts of everyday use ( such as running through the streets from one building to another because youre late for a meeting ).

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Yes its quite possible as long as you have the convertor to connect SSD's.
At what cost ? Runcore 32GB SSD works superb but its about RM700 or more. That said though, its blazing fast.