Yeah, it's the TV Station I work for are stuck on Quicktime and so any of my work for them has to be in that format. Preferably I would render to Sequenced Tiff or Photoshop.
@ bwtr Brian, all the times I have seen and with my own experience with other apps. A 32 bit piece of software will render the same scene faster on a 64 bit system than that same system will render the same scene with the 64 bit app, but only up to a point and that is where the RAM can not keep up with scenes weight; meaning the scenes polygons, lights, caustics, SSS, etc........ and I personally have not built anything of that scale even though my heaviest scene to date was 140 billion polygons. And that scene rendered faster in 32 bit that in the 64 bit app. So I will probably do as you and use the 32 bit Carrara 8 Pro for now.  
I have an HP - Canadian Q6600 with 8 Gbs of OCZ Gold RAM and a cheap, albeit very good 1Gb 9500 GT driving my graphics.

I would rather be Politically Incorrect,
Then have Politically Correct-Incorrectness!!!