Which laptop should I get? And why? Asus vs Lenovo?

Guys I'm considering buying one of these laptops. I really like the the 17.3 screen of the Asus but I really don't know which one to choose.

I'm a graphic designer myself, so, I need the laptop to use Photoshop and like programs, and some 3D softwares every now and then, and video editing. I will be playing Sims 3 on the laptop, too.

I will probably have this laptop for the next 2-4 years, so I want it to be a good buy.

Don't really care much about the screen resolution though, cause I will be getting and additional HD monitor to connect the laptop to.

I don't use the laptop on the "go", but I need to carry from house to house, so portability and weight is not a problem cause I will be putting it on a desk/table most of the time, will never use it on a car or bus, also since I'm only going to be using it at the house, battery is not really an issue

Lenovo Y510p: http://shop.lenovo.com/...#techspecs

Asus: http://www.bestbuy.com/...&cp=1&lp=1

Lenovo is better, I'm using it now.

How can I boost up my memory?