Best way to run 3 monitors (including big screen HDTV) from MP 4.1 with 4870 card

TIA for your help. I know there are already threads about mulitple monitors, but my specifics are slightly unique...
I currently run a 42" TV from the DVI port using an HDMI adaptor cable. Works great.
I'd like to add a 20" monitor (Dell Ultrasharp, lots of connectivity options) and a 17" (older, less connectivity options).
I'll never need all three on at the same time. One of the new monitors would display the same signal the TV gets; the other monitor would be a second screen.
What's the smartest way to do this? From my reading I figure it will involve a powered splitter of some kind. Does my 4870 have enough power to drive the two smaller montiors plus the 42" TV?
(I also have a 2011 MBP I could throw into the mix, but I'd rather just run everything off of the MP if possible.)
A semi-detailed explanation of what products I need and how to use them would be most appreciated. Looking for the simplest, cheapest solution.
Thanks!

I'll never need all three on at the same time.
The simplest, cheapest solution with the 4870 card (which has one Dual-Link DVI and one Mini DisplayPort) is to swap cables. Done!
If you did want all three at once, you could upgrade to the 5770 or 5870 card. These work in all Mac Pro models, drivers are in 10.6.5 and later. These two have one Dual-Link DVI-I port that can drive a wider-than-1920 DVI display directly. The other two ports are Mini DisplayPort, same as the 4870.
To drive one Single-Link DVI display with Mini DisplayPort, an inexpensive adapter will do. All these cards can produce a DVI signal from a MIni DisplayPort with the correct timing. But the signal levels are a bit on the low side, and when you drive two converters, the signal level is too low and the third display drops out.
The solution to this problem is to use ACTIVE converters, which boost the signal levels up and keep three display operating. For Single-Link DVI (good for up to 1920 wide or 1080p) you can get an ACTIVE adapter for about US$35. For Dual-Link DVI, the adapter usually requires a USB cord for additional power and the prices are close to US$100.

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Best way to run 3 monitors (including big screen HDTV) from MP 4.1 with 4870 card

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