sadly the above metioned price is for the US, not here. In anycase, ib will not give ALOT more performance, but it sure is a power saver. Now OP, there is a acer/lenovo/msi/asu laptop with gt640, which is the same as a gtx 460m, and it is within your price range.
Try to find or better yet order a laptop with a i5 or i7 accompanied with this gt640.
Now one thing about gt6xx series in laptops, ALL are 28nm, but not all are KEPLER. So becareful what you pick. So far only gt640 is kepler arch, others are fermi AKA gtx 5xx series on the desktop.
OP, i did a small research for you, i think most of these laptops will fit into ur price range once you order them from ROG store, as he is the only guy i know that can do such orders. Or find something similar @ pcandparts or someone around. DONOT buy from virgin or others, you will b ripped with high prices and old/slow laptops.
http://www.newegg.com/Store/SubCategory.aspx?SubCategory=32&name=Laptops-Notebooks
All are 1336x900, except for the asus one, which shows duo to its higher price tag,