Alienware m15x dudes help!?

i wanna put Dual NVIDIA® GeForce® GTX 280M, 2GB – SLI Enabled, and a 8GB Dual Channel DDR3 at 1333MHz in a m15x, i didn't buy one yet but i wanna buy the m15x and also is it possible to upgrade the processor to Intel® Core™2 Duo T9800 2.93GHz (6MB Cache, 1066MHz FSB)? please some one help me before i make the wrong decision...Please.