Uuh, I think going for the monitor is the obvious choice here, ESPECIALLY since you are playing cs go. You're experience will be 10 times better. As long as you don't sit like a freaking idiot then you shouldn't have to worry about your health. In case anyone is having issues with their back I doubt buying a $200+ chair would fix anything. I don't mean to be too oppressive but please don't go for the DX chair, your eyes will enjoy the 144 hz much more than your butt will enjoy that fancy chair.