Choosing between these gaming laptops... Cost vs. components

It appears, the only upgrades for the extra 500 bucks are a blu ray player...8gig more ram...different network capabilities, and going from an 870m to and 880m?...Maybe im missing what makes it worth the extra 500?
 


an 880m costs 600$, an 870m costs 400$, there's a 200$ gap between these two there. 8GB RAM is around 80$ 1600mhz, blu ray player is about 40$/80$ depending if reader/writer. there's still quite a gap though.