are you sure its 20" ? i just know that monitor has 20" size. all i know monitor 19" and skip to 21". CMIIW
Yup i do like to use my 42' LCD TV as my monitor while playing Games Playing games in Big Screens will give you great experience
it all depends on usage. If you like to watch movies then big screen is better but for usual work small screen will perform the same function. Anyway , I like small screens.
I also like normal screen! starting from 17"... I am having 15.5" displays for Laptop and Office PC! However i have 19" on Personal Desktop PC
I prefer 14 -17" , too big is not good and don't use to it. For watching movie, definitely yes, the bigger the better.