For serious computing instead of an air get a MacBook pro or mac pro. If I were still a professional I'd opt for the Mac pro but I think it's due for a refresh.
~KLM
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I wanna buy a Mac Book Air, will it suffice for a desk top jobs?
That sort of depends on what your usual desktop jobs are.I wouldn't want to undertake serious video or photo editing on an MBAir.And personally I prefer a larger screen than 11" or 13".
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