Log Monitoring

I really can’t find a good log monitoring GUI based tool for linux that does all the things I want it to: Filtering based on regexp, including any arbitray number of lines before and after matched lines, and the ability to expand and collapse the view of those included lines.
along with the ability to watch the current log in a separate pane, while analyzing selected parts in another. all with the ability to easily switch between diffferent logfiles on the fly.
does anybody have suggestions for other things for me to include? if i ever write it i’ll post up the program and let you *nix based dorks have at it.