well if its more expensive i guess its better....
and i recomend this
http://www.thinkgeek.com/computing/display/lcd/6665/ or another page of the same prduct:
http://www.doublesight.com/ it looks very cool! and the price well its ok for 2 monitors! and then u can just buy this
http://www.thinkgeek.com/computing/display/65ee/ and have tv and computer at the same time one in each monitor, is that cool or what