Honestly 1080p is enough still and if you dont care all that much maybe try the jump to what others call 2k (2560×1440). It's a huge jump in quality and wayyy easier to run than 4k. I wouldn't recommend ultra wide unless you know how to mod games and all your shows will have black bars. I will say you should try a dual monitor setup! It's convenient if you ever wanna boot up something separate or put a video on the side. Sometimes I'll play my ps3 on my main monitor and transfer files/do other tech stuff on my pc in the background. 100hz is good but if you can affordably get 144 or 175hz I'd recommend that too. Realistically you shouldnt't need to spend more than ~3-400 dollars on a new monitor, especially around holidays or days like fathers/mothers day. They get real cheap around them at places like Best Buy usually. Last bit of advice: price check always. I bought a monitor off Amazon for 50 dollars more than I would have paid on Newegg