Well, I've been looking into buying a new laptop because my current laptop chokes on the high-end graphic effects in CSS and HL2 + Ep1 and it then spits them out as white colours. Your budget is unreasonable. You will not be able to get a powerful enough computer to run the high-end graphics of HL2. And Episode 2 looks like it is going to kill your machine (and mine). I am looking at getting at least a 2 Ghz Dual Core Processor, at least 1gb ram, and aim for a 100gb-min harddrive + then attaching my current 80gb external harddrive, dvd player/burner, USB optical mouse, headphones+microphone, external LCD screen (45cm min). Don't look into buying a laptop with a large screen. After examining the prices, you are looking at an extra $1000(australian) just for a larger screen. You can then go buy a decent Plasma or LCD flatscreen monitor for about $300-$800 dollars. This setup will probably cost me around $2500-$3000 but you need to look at spending at least $2000 for a decent machine.