This question comes in 2 parts really
Dell Laptops with nVidia GPUs - are they all as-likely to fail as each other? I know there are significant issues with the GPUs 'melting off the board' (ala XBOX 360s) but are they all that bad - is a 2-3 years old XPS laptop likely to be a doorstop!?!?
What PC specific forums do you guys visit for techy stuff - not so much the overclocking, more hardware repairs, reliability fixes, driver fixes etc. etc (e.g. where else can I ask Part 1)!