For 820$ you can get a Dell Inspiron 1525 with:
Intel Core 2 Duo @2.16GHz, 4GB ram, 15.4 inch display (1680x1050), and a 320GB SATA Hard Drive (5400RPM). (http://www.notebookreview.com/dellCoupon.asp)
As much as I prefer discrete graphics, the X3100 is actually quite good. Good enough to be the only video option for the Macbook Air, Macbook, Thinkpad X300 and Thinkpad 61s all well received laptops.
What more do you need for heavy everyday work?