I would say make sure toy know exactly what you're doing. You're getting 1500 more gigabytes, awesome,but if you mess up not only have you wasted you're money,you have a broken console now as well.
I would wait to see if a new console is coming out personally. Save up for that one,would be better since you could get 1000+ gigabytes with it and it will be the new "next gen" for a while.
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It will also be astronomically more expensive. I spent my $500 almost three years ago, I don't plan on buying a new console anytime soon. I never upgraded my 360 either, my '07 Pro is still running fine today.