You might want to check out a laptop with a Llano chip.
If you are looking for a gaming machine for the long run, you will have to increase your budget, A. Gaming wears out computers quickly-especially laptops.
B. You will not be able to play current games and many demanding last gen games on high... that means the same for the future if not more limited.
Either way, Llano laptops are very afforadable, they range from 500-700 dollars and they are a great solution for gamers who don't have fat wallets.
I was a bit cheap, I only got the 2 year warranty. Maybe I'll call in to have it upgraded to 3 years. More importantly, I gotta call in and ask if I purchase a reinstall disk rather than having to rely on reinstalling from the HDD's hidden partition.
Unfortunately, the ETA for shipping out is August 1st.
Alienware has a pretty good deal out on the m11x, the processor is a real bottleneck and the screen is glarey as hell ( I used to be the proud owner of one); but for your purposes, it might work, especially since the i3 is just like a core 2 duo rebrand... and the 335M card can handle the games of years past on high and games of the present on medium-high