Q: Mac Pro 2007 with 3 displays?

I have a Mac Pro 2,1 (late 2007).

I'm running 2 displays via my Nvidia quadro fx 4500 video card. These are standard DELL 22" monitors (DELL 2208WFP)

I'd like to run QT videos (via my music software DAW) to a Toshiba 42" LCD screen. It has old VGA input (along with S-Video and RCA).

I'm currently using a FW Canopus box to do this (via S-Video), but it's no longer behaving well with my softwarre MOTU Digital Performer 8) and OS (10.6.8).

Is there any way I can run this 3rd diplay (Toshiba) without having to install a 2nd video card? (i.e. will a DVI 'splitter' do this?).

Thanks!