xoamberxo222, Well if you want to choose Alienware it wont be cheap. If you want to run smooth 60fps with all maxed out you need laptop with i7(4core version) + at least 7970M+8GB of RAM(i didnt check 4gb configuration). I have upgraded my laptop from i5 and 570M into this configuration and all runs perfect smooth. Earlier i was trying to upgrade 570M into 770M but still my frames drops. I think if you want to choose Nvidia gpu you will have to reach for 780M(expensive but very powerful) or maybe 870M( i think 860M is still to low for 2k15, but im not so sure about both of them) or higher ofc(970M/980M- those are mobile beasts). If you choose Clevo or MSI, maybe Asus you will spent 50% of Alienware price with the same configuration but ofc if money you can choose Alienware with mentioned configurations.
Your current rig cant handle 2k15 because of Vram on your gpu. You need at least 2GB for this title but not always 2GB is enough. Very often Nvidia or ATI releasing low quality gpus(750M/840M) with downgraded clocks, architecture but they adding a lot of Vram. So be careful.