Just did some quick browsing, here is a crappy extra large font I downloaded for free to demonstrate the effects loading a different font can have. Chatfontsize is 5 in the box, resolution loaded is 1768x992.
[You must be logged in to view images. Log in or Register.]
versus with Arial
[You must be logged in to view images. Log in or Register.]
You would definitely want a higher quality font than this one though.