Sony>> is light and portable, And that X factor that makes
it seem v-expensive and high class, Build Qualitywise , i had some
bad experiences with them =/ Flimsy Keyboard keys and Mouse
problems.
Other than that, it's quite good
HP>>It has "3d guard" that helps to reduce shock to your hdd.
But if u can't really afford a HP, get a compaq, they are good
brands in terms of built quality.
Acer>>The budget budget Pc now has quite a range of "quality"
Pcs, worth a try.