There is also very similar place to the "Hill of Tara" - "Navan Fort",
fortess of the Ulster Kings in county Armagh. I know both of the places,
they are do very interesting but, as you said - they were more important for
the history of pagan Ireland. There were no monasteries there.
P.S. I had some problems with you address, so I am sending the message
to a total list.