Hello, I'm looking to buy an Alienware laptop somewhere in between $1,500-$2,000. I've done my fair share of research but I'm still confused on some aspects. I see the newest Alienware laptop is the 18 correct? A little expensive but the dual graphics cards sounds very nice. Other than that I see the 13,15, and 17. However there's also different versions I've seen mentioned like the m17x or the "r2" or something like that. Can anyone explain how these differ from the standard 13,15,17,18? I'm really looking to run games like war thunder and ARK, maybe even battlefield 4 on at least 60+ FPS on maximum settings. Any advice on which route I should take? Thank you! Also, what is the difference between the 13,15,17, and 18? What makes the 18 the best?