I don't think 4k is a good option for you, since anything much smaller than 35" will display text too small to use the native resolution. You'll have to scale u

I don't think 4k is a good option for you, since anything much smaller than 35" will display text too small to use the native resolution. You'll have to scale up, stuff will look sharper but you won't have more real estate. (think retina macbook pro) Videos won't look better unless they are actually in 4k too. I'd go for 27-30" 2560x1440 or 2560x1600 display.