Maybe I'm wrong, but surely looking at a wide screen monitor, either the view will be stretched to fill the screen and therefore be distorted, or alternatively the picture will be the usual shape, and the edges will be blank.
If the graphics card support widescreen formats, many of them are now, there is NO graphics distoriation (streth or cut off) with widescreen TFT monitor.
This is just the same situation as widescreen TV. If TB signal is in widescreen format (many movies are), no stretch or cut off involved. The cut off or streth only come into play if the TV signal is in 4:3 format.
So Go for it, even your G-card does not support it, you can always get one which does with your deep pocket.