I'm in a similar situation and came here to ask the same question. I've beed debating on these two laptops and the MSI GT72.
I like this as a 15 inch
https/www.cyberpowerpc.com/system/Fangbook_Edge_4K_Gaming_Laptop
This only has a 970m but has a 4k display
I like this as a 17 inch
https
/www.cyberpowerpc.com/system/Fangbook_Evo_HX7-200_Gaming_Laptop/
I was going to update this to have a 980m and i7-4810MQ
I think they have slightly better specs then the MSI, and come in about $200 cheaper, but I'm not sure if its worth that instead of having a "name brand."