Most compilation authors put the supported resolution(s) in their file description. So, whenever you are looking for a UI for a certain resolution, go to the "Find" tab in the upper right of this page, check "Description" to search in, and enter your resolution.
I entered "1280x960" (no quotes) to find something for you.
This UI looks pretty good:
http://www.wowinterface.com/download...6766-KGUI.html
You'll need to update some of the addons in the package, though.
You could also try something from our Suites category. This one (like the above UI) is tailored to multiple resolutions.
http://www.wowinterface.com/download...130-LUIv3.html
There is also the Suite nUI which has its own download category and forum here, as it is a featured project. It also auto-adjusts for whatever resolution.
http://www.wowinterface.com/downloads/cat125.html