This was interesting. Which template is that? I thought it might have been tables so I was digging around your template and my
modified
template CSS side-by-side.. yes there are tables that isn't critical, but I thought "Why are there several < / br>'s in the middle of the comment"...
Administrator Back-end > !Joomlacomment component
Security tab > about halfway down...
Post max length: The recommended way to limit post size. Anywhere between 500 to 1000 for new sites is a reasonable margin.
Line max length: Always set this to -1 if your template is fluid or overly dynamic in content width (eg switchable font size). This is more of an "over-ride" than anything I suppose, for example incase your Joomla template or eyecandy extensions do fancy tricks with placement and presentation.
Word max length: Don't use -1 on this, it can break the template when super-long words are used (such as hyperlinks). Have a play around - personally I use 50, but 100 is also another good choice (if you want to make sure long links will be ok)
Edited after Daniel's feedback