Yes 260m is a good card and two is better. Like I said if AlienWare is your cup of tea you are getting what you can't even get new (BR) now. So think about $600/$700 off for a 6 month old system with a little warranty left that you can extend? Not a bad deal.
I will refrain from telling you what I would get for $1600 i7, BR, backlit keyboard and a better graphics solution, 8GB DDR3 RAM @1333Mhz built like Stealth fighter. And what reseller I would buy from as this is an AlienWare section and I am if nothing else a man with manners.
Edit: "G"ee I hope I live to be "73" and "j"ust have a "h"ome that is in "A1" tip top shape. And before then I hope to see many "xotic" places and have a killer "PC".