i configured a dell notebook with a core 2 duo. and it was 766$ with core 2 duo, 512 ram, 60gb hdd, and a dvd burner, and 15.4 screen. but it had integrated graphics, not the best for gaming IMHO. you can upgrade the videocard and it should only cost a little more.
MacBook 2.2GHz Santa Rosa | 120GB HDD | 4GB ram
Intel C2D E6300 @ 3.2GHz | 4GB ram | 880GB total HDD space | Gigabyte P965-DS3 | eVGA 8800GTS 640mb | Corsair HX 520 | Audigy 2 ZS platnium | Antec 900