I had no problems running a 6800GT with ATI's TV tuner a few years ago, and although the ATI TV tuner doesn't use the display drivers, I still had the Catalyst driver packing installed on my machine at the same time. I remember coming across this article a few years ago:
http://www.tomshardware.com/2004/11/...ia/page32.html
Even though they couldn't use both cards at the same time (6800 & X800, reboot to switch card use), the cards weren't fried by having and using either display drivers while having both cards installed. I do agree though - it's better to not go through the hassle of different card drivers. Stick with either manufacturer and using two different card models is cake.
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