Until now I used a dual screen display with my PC(2 19" LCD monitors, handy for my music-editing needs),
and I recently purchased an LCD TV.
I want to connect all three to my PC. there's a VGA, S-VIDEO and a DVI output(one of each).
I don't necessarily need all three to work simultaneously(although this would be ideal),
I can "settle" for having the option of having 1 PC LCD + the TV or 2 PC LCD working without the need of physically disconnecting and reconnecting the DVI cable.
you can only use 2 GPU outputs at a time on most (including your) card. You can hook up 3 monitors and then play with the windows settings in enabling and disabling monitors... but I think you will find that this process gets old quickly.
I would suggest getting another GPU (perhaps PCI?) that will fit on your mobo, and hook up the monitor with the least load to it.