have a look at
my posting on this thread. I know what you mean about the PowerStrip and Radeon Mobility incompatibility worry, I read lots about that myself. All that I can say is that I've had some success with this config at 800x480.
edit
My apologies, I got ATi Mobility confused with the ATi IGP.
Do a search on the
EnTech forums for 'mobility' to see what you can dig up.
James