Mac Pro 3 displays with 5870

So I did some searching and it seems I need two "active" adapters to get this to work?

Here's my specific dilemma. I have two 24" dell ultrasharps and a Mitsubishi LDT46IV. Right now I have the Dell's hooked up, one via DVI and the other through a MDP to DVI. The TV is hooked up via HDMI to my BM Intensity Pro for a viewing monitor out of FCP.

Now, I would like to add the Mitsubishi as an additional monitor as well as let it act as a viewing monitor. I will do this via different inputs to the TV. however, I only have a VGA port to access on the TV as it is mounted into the wall and that is the only port that Support felt we may need :confused:

EDIT - It appears I also have another HDMI port I can access as well if that helps...

So, what adapters and cables do I need to get this specific setup to work? I have no preference how I hook them up but I just need them all to work at the same time. And... I can't do a lot of trial and error because my budget for the year is used up and it's hard to get blood out of the stone that is Support.

THANKS!!!

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Also, I have a MDP to VGA that I hooked the TV up with and that doesn't seem to allow all 3 to work.