While I'm sure there are good scripts available, if you're finding it difficult to find one you like you might want to consider using individual addons instead. A lot of people seem to think their options are limited to vanilla mIRC or using a full script, while addons are overlooked.
The truth is that no matter how good a full script is there's probably several things it does that you won't need and several things you need that it won't do. Instead of settling for the closest match to your tastes you might find it more useful to think about exactly what things you want that mIRC doesn't do and then find separate addons for each task. It might not be all tied together as nicely as a whole script but often the focus on a single task leads to addons being better quality than their full script counterparts.
