Ok...here is my UTEngine.ini, UTGame.ini, Blossom mutator (with configs already set, just copy files) and SweetFX files, again, already set up.
The resolution is set for 1920x1200; I trust you know where to make the change if needed. Also, if you go into the game "advanced" settings menu, it will revert some of the .ini tweaks back to a lower or different value. To combat this, one would think to make the file 'read only', but this has been problematic, so it is best to simply not go into the advanced graphics menu.
All UTGame keybinds, etc are standard; I reverted those back to a default state. I am actually not sure if this file should be carried over or not. Backup your old files first, of course.
Hope its useful.
http://www.mediafire.com/download/87qzuojodzpa96z/UT3_Config_Files.rar
Edit: For anyone besides Al using these configs (I know Al has the GPU power), the AA is set at 12x and AF at 16x. Shouldn't be problematic for most GPUs, but just an FYI.