I recently purchased a laptop for university and gaming, and made the foolish assumption that gaming on a laptop would work well (NVidia GT 630M... say no more). I am now contemplating selling it for a Desktop and found this specification that hits my budget spot on:
That's a good spec ^. I'd save a little bit by dropping RAM to 4GB so you can step up to a GTX660. I'd also not buy a Lite-On (just had too many bad experiences with them). I'm in Eastbourne by the way, spent the day in Brighton today (primarily for the Krispy Kremes) :-)
EDIT: I forgot to say what to get instead of the Lite-On :-) Only writers that have never let me down were Samsungs. Minor detail anyway, but it's worth getting good everything.