thick and light doesn't work in this case. the variables are;
Thin and Light <4lbs (max screen up to 15")
Thick and Big Screen >5lbs (15-17" screen size)
Low end 1080p 965m
Mid 1080pm 970M
High 1080p 980M
With regards to the warranty (not sure what country you're in) but am certain you can buy some sort of protection.