I dont think there are that many "show sites" in tipp really. Im in the process of buying a house in Cahir so I should be getting a feel for the area over the coming year.
The hill-tops are covered in cairns and Im looking forward to climbing up to them.

What I could recommend and it might be nice is Longstone Rath, http://www.themodernantiquarian.com/site/7744,
Duntryleague isnt that far away either and is sign-posted http://www.themodernantiquarian.com/site/2577
Obviously wont be able to see these at night but they are fabulous and can be seen from Duntryleague
http://www.themodernantiquarian.com/site/8072.

I think they are the main sites North Cork and Kilkenny and don't know much about to be honest.

Two recommendations while you're down there:

Knockroe http://www.themodernantiquarian.com/site/1515/
easy access, excellent carvings, though maybe a little difficult to photograph

Bawnfree Hill http://www.themodernantiquarian.com/site/7461/
top of a hill, bit of a trudge, but amazing views

Cheers for all the pointers, looks like Knockroe will be on the hitlist and possibly Bawnfree hill (better charge up the lamps!) for a start. Duntryleague is also very tempting, if I'm feeling like a drive I might also go as far as Shanballyedmond for some nocturnal moseying.

The visit notes for Knockroe say its up a track, can you drive up the track or is it more like a trek? Any idea how long the track is as well?
Cheers :)