nUI works with any resolution, including 1280x800.
If you go to the Find tab and check off both title *and* description to search in, and type "1280x800" (without quotes) into the search box, you will find more UIs that support your resolution. I found 40 results, 3 of which were just updated last week.
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"You'd be surprised how many people violate this simple principle every day of their lives and try to fit square pegs into round holes, ignoring the clear reality that Things Are As They Are." -Benjamin Hoff, The Tao of Pooh