buying a laptop is always a bad investment in terms of money. initial cost is high, they can't be upgraded, and depreciation is massive (write it off after 3 years).
so, unless you really actually truly need a portable machine, steer clear of them!
Not sure I agree wholeheartedly with all of that - so long as you choose a decent processor in the first place then pretty much everything else is upgradeable - do you really want to be taking PC cases apart every 10 minutes ( unless of course you dropped 500 Rups in there and need it for the fiskal)?
I have a Sony Vaio Laptop , been well and truly used but cared for and has been brilliant value for money , has made me lots of money , and I am actively looking for another one .
It really depends on if you need a computer to actually work on or if you need one to lug about to various fashionable places to show how important you are .