Under $750

Hi, I'm looking for a good laptop for lightweight gaming under $750. My specs are: intel i7 2.2ghz at least, 8 or 4 gb of ram (upgradeable), nvidia graphics, dvd drive, at least 2 usb ports wifi b/g/n internet port 100/1000 display output (vga or dvi or hdmi) battery time for at least 3 or 4...