Questions Regarding Buying A Laptop

well ppl here helped me buy a nice cheap and a perfect pc for gaming (currently playing COD black ops :D )

now i wanted to ask about laptop

as i got admission in UET lahore and well i need one

(yes my new pc is all alone :( )

anyways

i wanted to ask a couple of questions

1) em doing Mechenical Engineering

so a laptop with a built in i3 proccesor 3D card with shared memory will be good enuf to run softwares like Auto Cad and other graphic software related to CAD and CAM

2) which do u think is the better option

Hp g62 (with i3 2.93 ghz pro .. 2 gb ram and 250 gb HDD)

or

Hp Probook (same specs)

which one do u think is a better option

and suggest any other laptop with in range of 45-55K that will full fill my educational requirements