Yeah, as for the money, get a job.
The MacBook Air is an excellent portable computer.
I am not sure, though, if I'd like to have it as my main computer.
I own a 21.5" iMac and a 13" MBA.
I use the MBA whenever I am at work, attending congresses and meetings, sitting in a café, relaxing on the couch. But whenever I am at my desk, I am glad, I have the 21.5" iMac.
In the end, it depends.
I've used notebooks as main computers for many years and I was fine with it, but after making the switch to a proper desktop computer, I wouldn't want to miss it.
Hard to tell what your preferences are.