Magheraboy is a bit tricky to reach.

I'd put Dooey's Cairn on the list
http://www.themodernantiquarian.com/site/1063/ballymacaldrack.html

If you fancy something very Irish then I would also try the lovely sweathouse at Tirkane:
http://www.megalithomania.com/show/site/658/Tirkane.htm

Of all the court tombs, if you don't fancy the long squelchy walk to Creggandevesky, I would recommend Annaghmare:
http://www.themodernantiquarian.com/site/5557/annaghmare.html