Can't tell from the specs about the Dell if it has 1600x900 resolution or 1920x1080. All it says is hi-def. As I said before, if you are fairly serious about gaming, the Asus is the better choice. Being open box, what kind of warranty does it come with?
I actually think that you'd be better off posting this subject here:
http://forum.notebookreview.com/ in the "what notebook should I buy" section. Let's face it, most of us here are going to be biased towards the Asus. Many at notebookreview will probably have experience regarding the Inspiron and can speak of the quality of the machine. To me, that price on the Dell seems like a killer deal, but only if it is full hi-def and of respectable build quality, and not prone to overheating when the gpu is pushed.
As much as I love my G75, if I had spotted a deal like the one on that Dell, I might have jumped on it instead. But then again, I'm not a gamer. I liked the styling of the Asus, the great cooling system, and the fact that I could add a second HDD, and that the display is full hi-def.
EDIT: Discovered that the Dell's display is only a glossy 1600x900.
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ASUS G75VW
i7-3630QM 2.4Ghz
GTX 660M (2GB)
16GB DDR3 1600Mhz
1TB HDD
2TB HDD
Blu-ray Writer (Pana. UJ-260)