I bought Samsung 2033SN three days ago, and I am pretty impressed with it so far. Before this I had LG 15" lcd which I got way back in '04, and had its backlight replaced recently, but the difference in brightness was a hell lot more than what I was expecting.
But if you want higher than 1600x900 resolution, you should get 22 or 23" with full HD resolution.
But if you want higher than 1600x900 resolution, you should get 22 or 23" with full HD resolution.