I would say it depends on how much the premium costs, what else you use the laptop for, and how much you actually use it to game on. Depending on budget and usage you might want to consider stretching to more of gaming style laptops.
My last couple laptops have been ASUS N-series ones, and even with a quad-core i7 and lower end discrete GPU (Geforce 635M) it was only CDN$830. I never bought it to game on though, it was just the best lower cost option with a quad core and a 1080p IPS panel. It is perfectly passable to play older games at reduced settings, though some do just become unplayable. If your budget is reasonable, something like this would be a great option as well.
http://www.newegg.com/Product/Product.aspx?Item=N82E16834890015
Quad-core and 960M with a 1TB HDD and a 128GB SSD.
That being said, a cheaper entry level gaming laptop has some pretty big compromises, so if you just want to occasionally fire up some Diablo 3 you might not want to sacrifice panel quality or portability to get a better GPU. If that's the case, the discrete AMD option would work fine.