Which Laptop for AutoCAD drafting?

[shoarch]

I am going to buy a laptop for AutoCAD drafting? I have been nailed down to ASUS K53SV-A-1, ASUS K53SV-XR2, or DELL Inspiron 15R. These are all Intel i5 with 6Gb memory and dedicated video card. They are about the same price between $750 to $800. I have also looked at TOSHIBA but it's a bit more expensive. Have you all come across with any of these models. Any suggestions for other brands. Thanks in advance.