4GB or 8GB of RAM memory

B... said:

Right. While most here claim 8GB is the new 4GB, the vast majority of Air users get the base model and are fine with it. Another consideration, though, is how long you plan to keep it.

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To an extent. But when you're spending say, $1k, spending ~$100 to double the effective life of the machine may be the difference between being able to sell it in 12 months or not (or not without taking a big hit to resale price).