Seeing that pollxn really is quite simple and I would like something a little more robust, I went on the hunt again and came out with blogKomm which seems to be what I want. I'm not really sure why I didn't choose this one before? It has everything I could need! Installation is straightforward and probably doesn't even need to be documented as in the case of pollxn. About the only thing I think that needs to be done is adding the comments link in the entry templates.