Do you mean the 60D? If yes, that is virtually a new camera. Why do you think you need to upgrade it? What lenses are you using?
Canon only makes one other APS-C sensor camera above the 60D: the 7D. Beyond that Canon offers four full-frame sensored cameras, the 5D mkII, and the 1D mk III, mkIV, and the 1Ds mkIII. The jump in price is hundreds (to the 7D), to thousands (the least expensive full frame is $1500 more, the most expensive is $6K more).
I would like to upgrade from my Canon EOS D60, and there are so many products to look at, my head hurts. Can anyone offer some advice as to which Canon SLR I should upgrade to?