Who knows the cheap gaming laptop?

I am just asking a laptop that can play some online games without lagging and hurting my eyes. My budget would be lower than $1000 CAD. I also want it be strong that can stand for more than eight years because I usually turn on my computer fifteen hours a day. So please anyone give my some suggestion which brand of computer I should buy. I almost forget. The screen should be at least 13 inch. Thank you.