For $820 you can build a desktop that will run circles around that. Check out this build I threw together:
http://pcpartpicker.com/user/stonvnox/saved/37Ps
An i5-4430, GTX 760, 8GB RAM, a 120GB SSD and a 1TB HDD.
Unless you are on the go 24/7 and absolutely must have a gaming laptop, I...