Hubski uses Arial or Helvetica depending on your system (Windows default to Arial and Macs default to Helvetica). And the snobbier students will still give you a hard time for Arial (because its essentially an Helvetica knockoff). After a while every font starts to feel monotonous so don't feel to bad about it seeming that way when your looking back at things. Helvetica is as overused as they come (Helvetica Neue though; now thats catching up a bit).

I can sort of see where your coming from on the readability of comic, but I bet your using it your titles, and its not doing what you think it is. It looks good and in the right place in small speech bubbles but not really as a title (since its based off of comic books). What your really looking for is a display font which is specifically designed for titles and to be expressive (and more readable at larger sizes). Take a look around myfonts.com and I bet you'll find something. Comic was never really designed to be a display font and thats probably why it starts to look a bit monotonous after a while. Hope that helps you escape your students ire.