Maybe other graphics cards (the ones with TV input) allow the connection of peripherals?
If not, how can I use the monitor as a TV to receive input from a wii/ps3?
The way that this is normally and easily done is through a monitor that has multiple inputs. This monitor you have linked to just has an analog 15pin (blue, older monitor connector), and a digital DVD-D (usualy white, newer monitor connection). This would allow you to hook up two computers or a computer and something else. This monitor you linked to would not be ideal for what you want if you want the wii/ps3/computer hooked up all at once. You need a monitor that has hdmi, composite HD, or composite input options along with the normal analog and digital dvi connections.
I, for instance, use a dell 2709w that has 9 different input options so i can connect all kinds of things to it and just switch the input selection on the monitor to go to it.
So you connect all the devices to your monitor and just switch between them on the monitor. No need to run any of them through a video card.
And just a note, that video card is pretty basic. It would work great in a computer that did not play games or edit video, but if you do, definatly look at something else.
One of the easiest places to look through monitors based on features is newegg.com. It can at least give you an idea of what is out there. I personaly like Dell's Ultrasharp LCD's, but that is my opinion and they are not cheap monitors.