Like I said, don't be expecting to cash out cheap and expect to get good results. Remember that you will be using that mouse for a very long time. Maybe even a couple of years. You need to best bang for your buck. The more expensive the mouse, the better as it will produce outstanding results and long-life (unless you're going with Razer, it's overpriced asf.) The Logitech G502 maybe be almost twice as expensive as your budget, but I will tell you now - it will produce 4x better results than any other cheap mouse. Like I said before, the G502 has the best sensor, so if you're doing CAD, you need those precise movements. Click this link to show you how accurate the mouse is. Although the mouse in the video is a wireless one and a different model, it has the same sensor, thus same results.