I’m searching for 17” crt monitor and found samsung 793DF for $130, 793MB for $154, and 765MB for $156 at local store. What magic bright feature really means? Is that just about brightness and contrast programing? And is this feature worth $24 different betwen 793DF and 793MB or not? Im using monitor for read text, games, and watching DVD. Which one of three monitor above should i go for? Thanx...