still the solution to buy used hp EliteBook ( 8740w ) on ebay for around 400-600$ US
the come with a 17 inch lcd , Nvidia Quadro GPU ( look for the FX3800)
i7 quad core usually 8GB ram , 7200 rpm HD
just have to add a SSD drive and another 8gb of ram .. to have a really good laptop for CAD, DAO, 3DS
still pretty good without adding anything
most of then get paid more than 2500$ 3 years ago ..
the are easy to upgrade , you can change de GPU later , CPU, add RAM up to 32 gb
this is profesional mobile morkstation whit military resistance .... heavy duty !
so it's your call for the same price... a brand new Ford Fiesta or a 3 years old BMW M5....