Kuiper Belt (KBOs):136199 Eris
50000 Quaoar
90377 Sedna
20000 Varuna
90482 Orcus
28978 Ixion
136472 Makemake
136108 Haumea
If you are using astro.com, then currently all of these (except Makemake and Haumea) are handily in the "Additional Objects" window on the Extended Chart Selections page.
Or, just copy and paste: 136199, 50000, 90377, 20000, 90482, 28978, 136472, 136108
The list is copied from Tigerlily's "Master List of Asteroids by Theme," which others have also added to in the thread:
http://www.linda-goodman.com/ubb/Forum28/HTML/000044.html