I looked at the Dell XPS and AlienWare stuff before going with PCS and one thing I could never figure out on Dell's 'self-configuration' system is why going from 4GB of memory to 8GB of memory costs £330. Is it gold-plated or somesuch?
All of Dell's basic builds look like good value because you think you will be able to afford to upgrade, but it is shockingly expensive to do so.