I checked it out again... you are running into a minimal width that the reply box has to be to be able to fit it all in.
My recommendation would be to keep the fixed width of your nav table on the left, but make the rest of it to the right (the part that includes your ubb) a variable that fills up the screen (make the overall table a percentage (like 95%) with the nav a set width (like 120px)) that would take care of your widths and keep it from looking too small on a larger monitor (anything 800x600 and up). That's the way this site is set up. If you must keep a fixed width, then make your site for a larger screen - a site I am working on does this, the site is 705 px wide...
I am not sure how you are getting larger fonts at the bottom of your screen... that should be taken care of in your style settings.. unless you have something weird working in a .css file or in your footer...
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Allen
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http://www.stand318.com