I am wanting a laptop for my primary computer. The 13" is too small for my liking and would prefer a dedicated graphics card. I found two late 2008 Models one with 256 and other with 512. 150 dollar difference between the two. I will more than likely be keeping this for 2-3 years. At most I use it for is internet, email, watching DVD's, video encoding and possibly some light gaming. I don't know much about graphics cards really. Mainly wanting the extra screen real estate cause I usually have multiple windows open at once. Which should I buy?