I'm thinking about getting a laptop to replace my aging Dell C610. I'm looking to get something faster as well as something more sturdy. Besides HD's and memory can lappy's be upgraded with newer mobo's and CPU's? What about video? Are you stuck pretty much with what you buy and have to replace the entire unit to upgrade? I know with my old Dell I can upgrade the CPU but the entire system is so slow even that won't get the speed up to where I would like. Thanks for your info.