Here check out my suggestions on this thread - Font Size on the 8700C
So I like the BBClarity font but wanted something smaller than size 7. Well through messing around I found a way to get a font size smaller than 7, I think it looks like a 6.
1. Start w/ the clarity font and size 7
2. Change your current font to BBsystem, size 10 is the only option I believe
4. Now change your font back to clarity and save, do not change the font size
You'll now see that the font is smaller than 7. Enjoy.