I came across a couple more I forgot to add to the list, Smaug.

Tethys ~ magnitude 10.2 and orbits in less than 2 days. (within the orbit of Rhea)

Another unusual moon that is visible with a 15cm aprture is Iapetus, orbiting way out there (80 days), and having a variable brightness from ~10 to 12th mag. It is thought to be due to changes in reflectivity of surface composition as different hemispheres of Iapetus face the earth.

G^2