Need help with XF86 config

[Andrew Konosky <TerranAce007@comcast.net>]

After I got the base system installed, I selected "Desktop Environment" 
and apt installed both KDE and Gnome, Gnome as default. I switched it 
over to KDE and KDM, but the installer didn't set up my graphical config 
right.

My Radeon 8500 graphics card and my Philips 107P monitor are detected 
right, and I chose the resolutions I wanted to use during the config, 
but both KDE and gnome defaulted to 800x600 @ 75Hz, and no higher 
resolutions were available. I tried removing all other resolutions than 
the 1280x1024 which I want to use, but I still get 800x600 and 1280x1024 
is not even an option. I have all these other low resolutions available, 
but where are they coming from and what command do I run to reconfigure 
the graphics setup?

Thanks!