Having just gone through the post count thing myself, it does seem to me that it encourages the creation of many low-quality 'fluff' posts.
I'd like to see a greater focus on community ratings. Perhaps another bar graph indicator where rep is divided by post count (this could replace the 'today' graph, which seems to me to be a rather low-value indicator).
To avoid penalizing talkative members who like to socialize in the general forums, posts in forums that are primarily social in nature would be excluded from the post count calculation. (Ideally the calculation would be forum-specific, but that's a lot more involved, just excluding certain forums is a pretty easy query).
Just an idea.
Grippy has approximately 30,000 hours of Delphi coding experience. srsly.