Help me to estimate my alienware

[DJC___]

Hello everybody

I want to sell my alienware m17x r4, but i don't know how much i can ask... This is the hardware composition:
Generation Intel Core i7-3630QM - 3,4Gh
16Gb Ram
500Gb Hdd - sata
HD7970M 2Gb
The pc is in perfect condition, no scratches, i never had any problems!
How much, more or less, can i ask for this machine?

 

[hang-the-9]

On ebay those are in the range of $750-800 but that is asking prices not what they have sold for.