Otherwise you're only rationalizing irrational choices.
Yes, I guess that it has more to do with irrationality than other.
By ding of reading "how fast is Sandy Bridge", I was wondering: "how useful is that Sandy Bridge speed"?
The 2500K which I'am currently insanely oc'ing (5.1GHz and counting) in my bench room surely is fast, but when I stop stress testing and just play around with it, I'm a bit disappointed, exactly as when I swapped my laptop 120GB drive with a blazing 160GB SSD: is that all?
Up to now, for any not specific/demanding task, I'm quite convinced that it's all here, and that what there's already here, it's quite enough.
Browsing and light office stuff can be done on a cheap laptop unless you work with quality photographs or something requiring better displays.
Or unless you want silence. The Vaio I am typing on right now is very faintly sounding: but it has never been silent (some boxes lying around at home would look like dead, if there were not the activity leds). However, I see the point.