For a machine with non-spectacular, non-upgradeable specs it is ovepriced, in my opinion. Like I said earlier, the OP is better off with the MBP. Just look at his requirements, they are absolutely SCREAMING MBP over MBA.
Priorities: upgradeable memory/HDD (implied by that last point), robust build. Repairable (ok he didn't say this, but if the HDD dies out of warranty then "long lasting/I don't want it to break down" also implies it can be fixed without sending it away).
NOT priorities: portability
I know it's par for the course for you Apple lads to want the shiniest, flashiest thing Jobs pushes to market, but the OP would be FOOLISH to buy the MBA with his requirements.
They are arguing semantics, you are saying overpriced, they are saying, compared to what?
If you were to say that it is expensive for what you get, then they might agree with you, or at least have one less thing to disagree with you about.