Sony Vaio EA or EB? 6cell battery or 9cell battery?

I'm confused choosing between EA and EB.
EB keyboard seems complicated with the added number pad and the mousetab on the bottom shifted a lot to the left.
How's the keyboard typing experience between the two? Do you guys find the number keypad to be useful on the EB???

One other thing, should I get the 6-cell or 9-cell battery? How much bulk and weight does the extended 9-cell battery add?

thx

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