agreed on font.
too many going on.
make them consistent and quite a bit smaller.
you probably want something the size of the font on this page.
most browsers have the ability to go bigger or smaller on the text size so if you worried about a special category of readers not being able to read your site, they probably already have their system adjusted for a 'standard' web font size.
also, comic sans is a big no no nowadays
i do like how the forum colors kind of match the header,
always a nice thing to have some consistency from header to bottom of the page,
good start.