These are bit out of budget but since you'll be using it for awhile better to spend a bit more now. They're both 15" difference being a 1920 screen vs 1366 and bluray vs dvdr. AutoCAD really works better with the professional type of graphics cards like Quadro and FireGL. The Dell Precision are great since they use those cards but they start at $1300.
Here's some from Lenovo with Nvidia GTX660m 8GB RAM and Core i7
$949
Laptop Computers | IdeaPad Y Series | Y580 | Lenovo | (CA)
$849
Laptop Computers | IdeaPad Y Series | Y580 | Lenovo | (CA)
Here's a Lenovo with Quadro but at $1187
http://shop.lenovo.com/SEUILibrary/c...C5707478FDCCD0