upgrading my laptop

[water dog]

okay this is one for all you computer flippin nerds out there that know what they are doing when it comes to computers (i don't). im wanting to refit my laptop to upgrade it to fit these specs



i want these specs, but a little better if that parts would be cheap or if the next step up isn't much more expensive.

this is what my current computer is:
http://reviews.cnet.com/laptops/asus-g50...96181.html

so what should i get? is my laptop even able to be upgraded? these are probably retarded questions but i also have a few more at to throw at you that may or may not be equally as ignorant :- )

my laptop case/shell/whatever you wanna call it is all shipped and broken and parts are missing or have melted off and the hinges are loose/broken ETC. its basically in shit shape. also one of my keys are completely broke (my f10 key). is it possible at all to buy a brand new laptop case and still have all my hardware and screen fit inside of it? like, i just want the plastic shell parts, no electronics or anything, just the basic outer shell. would i have to get an exact manufacturer copy or could i get somehting custom?

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oh yeah and this is relevant to gaming because im upgrading ti for games :- )