Core i4 processors huh?
Also, you're going to find such a wide range of shit, from any maker, in that price range. A lot of places are still selling last gen stuff in that range while you can also find current gen such as an i3 or i5.
Gateway has the ID49C08u which has an i5, 4gb DDR3, and nvidia 330m (great for gaming, HD content, etc) for $850.
Dell is offering their Studio 15 or Inspiron 15R (whichever looks better to you, essentially the same guts) with an i5, 6gb ddr3 ram, and an HD 5470 (not quite as good as the 330m, but way better than integrated) for $680 after a couple of coupons.
Asus UL30A-X5K is a lower power (previous gen processor), but highly portable and long lasting battery laptop for $600
Lenovo G460, core i3 and 4gb ram, but Integrated video (fine for every day surfing, but may stutter processing HD video such as YouTube 720p) for $550 after coupon.
HP G72t 17" screen, core i5, 4gb ram, integrated video for $675.
Are you looking for a large screen mobile desktop style, normal notebook all around performer, or an ultra light and portable? That will help narrow down the field