Agree with WR2, Duo processors are quickly becoming out-dated. At minimum you should be looking into the 2nd Gen Intels, usually the i3 for laptops however some come with i5/i7 but these carry a higher premium.
I can't seem to figure out how you get a model with Core i5 2410M CPU, 4GB RAM, 500GB HDD, DVD burner, 14" 1366x768 LCD w/ GT 550M graphics for only $679. When I configure it it comes out to $764.