Then back the kwality up with a warranty.
Apple delivers a standard one year warranty which you can pop to 3, Dell provides the same warranty but extends to 4 years AND I've never so much as talked to a Dell rep since I'm certified, I just RMA my own hardware without an issue. Can't do that for the Mac w/o a huge hassle. I won't mention that we replace more power supplies out of Macs than we do Dell desktops and its not uncommon for a crapped out PS to toast the entire Mac.
FWIW, the OP can buy an AMD Neo whatever now, pocket the other $500 bucks and buy a newer model when the original dies. Now he's still spent less than the MBA and he's got newer faster hardware. And honestly, he can probably scrap parts out of the old netbook if he desires. After three years your non-replaceable battery has shortened up it's lifespan to the point where it's easier to measure in minutes than hours and if our customers are any example, at least one hinge is busted and you've lost a key.
Logically you can't both resell your laptop and keep it for the long hall. Either it dies and you buy a new one, or you sell it and it's a case of diminishing returns, no one will want your four year old MBA badly enough to let you buy another one anyway.
Eventually you too will realize that all hardware sucks, all software sucks and all technology sucks. Or you'll still be a fanboi, either way I'm too old and tired to give a crap as long are you're too stupid to care.