Dual cards, for more displays

so this mac pro, currently has an ati X1900 card installed, which has 2 DVI ports on it. Bottom line, im thinking about maybe having up to 3-4 displays hooked up to this thing symaltaniously. One of these I may want to be my Old SD 60" TV which only has RCAs or SVideo ports. Heres my question, what is my cheapest option to get from dvi to rca/svideo? what would be the cheapest card i could get that could work side by side with my X1900?
Thanks for your help
Machine specs:
Mac pro 1,1 2.66 dual dual core
7GB ram
currently installed: ati X1900

DVI-I ports like the ones on Mac display cards have two complete sets of signals. One is the one you expect -- a dual link DVI capable of driving large digital displays (over 1920 wide).
The other is a complete VGA, which is in the bar at one end of the connector, the four pins around it, plus Horizontal Sync, also used in the digital section. This gives you the four essential signals of VGA: Red, Green, Blue H-Sync, and V-Sync, as Analog signals. A DVI -> VGA adapter only shuffles the wires around to produce VGA.
When you say your TV has RCA inputs, do you mean it has Red, Green, Blue, H-Sync V-Sync inputs, or that it has one yellow NTSC composite Video input? There are simple converters that can combine Red Green Blue and the Syncs to get composite Video.
There even seems to be one that extracts VGA and converts it to NTSC composite Video for US$19 from the Apple online store, or your local store:
Apple Store: Apple DVI to Video Adapter

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