I suggest you buy DIY notebooks from OCZ
Though many companies offer customization and different configurations, nothing compares to the options available to you with a DIY notebook kit. When the components and features are selected by you and it's built by you, it's more like you.
Because you are buying the DIY notebook kit before the hardware is marked up and a tech assembles it, the savings are passed down to you. Additionally, you won't need to replace your entire laptop to swap out the CPU for a faster one, upgrade your RAM, or increase your hard drive storage capacity.
check it here:
OCZ Technology | Products | DIY Notebooks
the downside: you have to order it online