Sorry, I know this has probably been posted a few times but I just wanted to know what everyone recommended. Currently I am using the stock memory but I want to upgrade to 4gbs because my computer is running sluggish when watching video and doing other things. For instance when I watch netflix and surf the internet at the same time, my keyboard lags and the computer runs sluggish. I think the memory upgrade should help. What does everyone recommend for 4gbs? Links would be appreciated. Thanks!