Try setting you resolution to 1280x1024 - you should see it all in that resolution.

Then try this: Open your RAW editor and resize it to be smaller, then continue your edit and open the file. Close the file, then minimize PS3, and change your settings BACk to 1024x768. THEN open a RAW file again and see if the dialog box stays smaller from when you resized it (you could also, before changing the size back to 1024x768 open the RAW editor - just thought of that - and see if it's still the smaller resize).

Basically, more things are going to higher resolutions for the regular working area (Softimage XSI needs to be on a monitor no less than 1280x1024 or you won't see then whole thing and cannot access menus at the bottom - this is non-negotiable as you can NOT resize the screen), so you should probably just do it anyway and take the time to get used to it - took me a few days to get over the smaller size of icons and type, but now it looks like something out of "Romper Room" when I try and resize my settings to 1024x768.

Good luck-
-Lew ;-)