Alright, it is outdated since its 2gb. How is your cpu usage? Are they also above 75-80%, and are all the cores being used in a similar way? Perhaps you can overclock your gpu a little and see what happens, that might give it a slight boost. As for the mouse, it just depends on whatever you are comfortable with. I have always used logitech, so its been the best for me. You can try logitech g502 which is quite nice. Just tweak around with different settings since you are planning to make a new build soon. One thing you must consider is the fps you are playing with. You said you get an avg of 150-200 fps which is quite good, but considering you use 144 hz, its a bit low. From what I heard its good to have double fps compared to your hz for a smoother game play. (correct me if I am wrong there). Just saw that in forums before when I was contemplating what monitor to buy before. So for example 240 fps for 120 hz would be perfect. However, i did not notice much lags when I had a bit lower fps, so cannot really go further into that. Just use the ps/2 for now and you can try new things when you begin your new build.